Air Pollution

Latest story

138 Shares189 Views

E.V. Tax Credits Are a Plus, but Flaws Remain, Study Finds

by

The Inflation Reduction Act was a compromise between competing priorities. Evaluating the law on the effectiveness of the $7,500 tax credit for E.V.s is tricky.A team of economists has taken on a central component of the Inflation Reduction Act: the $7,500 tax credit for U.S.-made electric vehicles.The challenge in evaluating it is that the policy has sometimes conflicting goals. One is getting people to buy electric vehicles to lower carbon emissions and slow climate change. The other is strengthening U.S. auto manufacturing by denying subsidies to foreign companies, even for better or cheaper electric vehicles.That’s why totaling those pluses and minuses is complex, but overall the researchers found that Americans have seen a two-to-one return on their investment in the new electric vehicle subsidies. That includes environmental benefits, but mostly reflects a shift of profits to the United States. Before the climate law, tax credits were mainly used to buy foreign-made cars.“What the I.R.A. did was swing the pendulum the other way, and heavily subsidized American carmakers,” said Felix Tintelnot, an associate professor of economics at Duke University who was a co-author of the paper.Those benefits were undermined, however, by a loophole allowing dealers to apply the subsidy to leases of foreign-made electric vehicles. The provision sends profits to non-American companies, and since those foreign-made vehicles are on average heavier and less efficient, they impose more environmental and road-safety costs.Also, the researchers estimated that for every additional electric vehicle the new tax credits put on the road, about three other electric vehicle buyers would have made the purchases even without a $7,500 credit. That dilutes the effectiveness of the subsidies, which are forecast to cost as much as $390 billion through 2031. “The I.R.A. was worth the money invested,” said Jonathan Smoke, the chief economist at Cox Automotive, which provided some of the data used in the analysis. “But in essence, my conclusion is that we could do better.”How the Environmental and Safety Costs of Gas- and Electric-Powered Cars Stack UpMeasuring the cost to society of carbon emissions from driving and manufacturing, local air pollutants and the danger of crashes, a new economic analysis finds that some gas-powered vehicles are less damaging than electric and hybrid vehicles.

.dw-chart-subhed {
line-height: 1;
margin-bottom: 6px;
font-family: nyt-franklin;
color: #121212;
font-size: 15px;
font-weight: 700;
}

The five least and most costly gas- and electric-powered vehicles
Averages are weighted by the number of each model registered within each powertrain category. Total costs subtract fiscal benefits from gas taxes and electricity bills.Source: Hunt Allcott, Stanford; Joseph Shapiro, U.C. Berkeley; Reigner Kane and Max Maydanchik, University of Chicago; and Felix Tintelnot, Duke UniversityBy The New York TimesWe are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

More stories

  • 138 Shares179 Views

    in Economy

    Polluting Industries Say the Cost of Cleaner Air Is Too High

    by

    As the Biden administration prepares to toughen air quality standards, health benefits are weighed against the cost of compliance.The U.S. Environmental Protection Agency is about to announce new regulations governing soot — the particles that trucks, farms, factories, wildfires, power plants and dusty roads generate. By law, the agency isn’t supposed to consider the impact on polluting industries. In practice, it does — and those industries are warning of dire economic consequences.Under the Clean Air Act, every five years the E.P.A. re-examines the science around several harmful pollutants. Fine particulate matter is extremely dangerous when it percolates into human lungs, and the law has driven a vast decline in concentrations in areas like Los Angeles and the Ohio Valley.But technically there is no safe level of particulate matter, and ever-spreading wildfire smoke driven by a changing climate and decades of forest mismanagement has reversed recent progress. The Biden administration decided to short-circuit the review cycle after the E.P.A. in the Trump administration concluded that no change was needed. As the decision nears, business groups are ramping up resistance.Last month, a coalition of major industries, including mining, oil and gas, manufacturing, and timber, sent a letter to the White House chief of staff, Jeffrey D. Zients, warning that “no room would be left for new economic development” in many areas if the E.P.A. went ahead with a standard as tough as it was contemplating, endangering the manufacturing recovery that President Biden had pushed with laws funding climate action and infrastructure investment.Twenty years ago, generating electric power caused far higher soot emissions, so “there was room” to tighten air quality standards, said Chad Whiteman, vice president of environment and regulatory affairs at the Chamber of Commerce’s Global Energy Institute, in an interview. “Now we’re down to the point where the costs are extremely high,” he said, “and you start bumping into unintended consequences.”Research shows that in the first decades after the passage of the Clean Air Act in 1967, the rules lowered output and employment, as well as productivity, in pollution-intensive industries. That’s why the cost of those rules has often drawn industry protests. This time, steel and aluminum producers have voiced particularly strong objections, with one company predicting that a tighter standard would “greatly diminish the possibility” that it could restart a smelter in Kentucky that it idled in 2022 because of high energy prices.Technically, there is no safe level of particulate matter, and ever-spreading wildfire smoke driven by a changing climate and decades of forest mismanagement has reversed recent progress.Max Whittaker for The New York TimesNew factories, however, tend to have much more effective pollution control systems. That’s especially true for two advanced manufacturing industries that the Biden administration has specifically encouraged: semiconductors and solar panel manufacturing. Trade associations for those industries said by email that a lower standard for particulate matter wasn’t a significant concern.Regardless, public health advocates argue that the averted deaths, illnesses and lost productivity that air pollution caused far outweigh the cost. The E.P.A. pegs the potential benefits at as much as $55 billion by 2032 if it drops the limit to nine micrograms per cubic meter, from the current 12 micrograms. That is far more than the $500 million it estimates the proposal would cost in 2032.So how are communities weighing the potential trade-offs?On a state level, it depends to a large degree on politics: Seventeen Democratic attorneys general wrote a joint comment letter in support of stricter rules, while 17 Republican attorneys general wrote one in favor of the status quo.But it also depends on the mix of industries prevalent in a local area. Ohio offers an illuminating contrast.Take Columbus, a longstanding hub of headquarters for consumer brands that in recent years has leaned more into professional services like banking and insurance. The Mid-Ohio Regional Planning Commission, a coalition of metropolitan-area governments, called for the E.P.A. to impose the nine-microgram standard.“There may be some economic costs to major polluting industries, but there’s real health and environmental costs if we do nothing,” said Brandi Whetstone, a sustainability officer at the commission.Columbus would incur fewer costs from tighter regulation, having enjoyed strong job growth in recent years driven by white-collar industries. But local leaders also think that clean air is a competitive advantage, with the power to draw both new residents and new businesses that value it.Jim Schimmer is the director of economic development for Franklin County, which includes Columbus. He has been pushing a plan to turn an old airport the county owns into a low-emissions, power-generating transportation and logistics hub, complete with solar arrays and electrified short-haul trucks, and he thinks stronger rules on particulate matter could help.“This is such a great opportunity for us,” Mr. Schimmer said.The E.P.A. is about to announce new regulations governing soot — the particles that trucks, factories, wildfires, power plants and dusty roads generate.Mikayla Whitmore for The New York TimesThe Cleveland area is a different story, with a high concentration of steel, chemical, aviation and machinery production. Its regional planning council declined to comment on the prospect of stricter air quality rules. Chris Ronayne, the Democratic executive of Cuyahoga County, was cautious in discussing the subject, emphasizing the need for financial assistance to help companies upgrade to lower their emissions.“I think there is an attitude of ‘work with us, with carrot approaches, not just the big stick,’” Mr. Ronayne said. “Come at us, in a manufacturing town, with both incentives to help us get there as well as the regulation.”Ohio has an entity to help with that. The Ohio Air Quality Development Authority was created 50 years ago to clean up the brown clouds that came out of smokestacks, using a combination of grants and low-cost revenue bond financing to help businesses fund upgrades like solar panels and scrubbers that filter exhaust from industrial facilities like incinerators and concentrated animal feeding operations.Now, more funding than ever is available — through the Inflation Reduction Act, which set up a $27 billion “green bank” at the E.P.A. to finance clean energy projects. Christina O’Keeffe, the executive director of the Ohio agency, said she hoped that would allow her to get into direct lending as well when more companies needed her help to meet a stricter air standard. There are also billions in the offing to help heavy industries retrofit to lower their carbon emissions, which tends to help with particulate matter as well.Public health advocates argue that the E.P.A. should set its standard regardless of the assistance available to cover the cost of compliance.California, for example, has spent more than $10 billion to help factories and farmers pollute less. The state’s Central Valley is still the only area that is in “serious” violation of meeting the set standard of 12 micrograms per cubic meter of particulate matter. The country’s six most polluted counties, which include the cities of Fresno and Bakersfield, have annual readings above 16 micrograms.The Central Valley Air Quality Coalition, an advocacy group, has been pushing for more aggressive enforcement for decades. The group’s executive director, Catherine Garoupa, points out that despite the persistent air problems, the federal government has not imposed strict curbs, like holding back highway funding.“One of the huge imbalances in our region is that the trend has been to cater to industry, treat them with kid gloves, give them billions of dollars in incentive money for them to continue their practices,” Dr. Garoupa said. “They’re generating wealth, but not for the people that actually live in the valley and are breathing the air.”California has spent more than $10 billion to help factories and farmers pollute less.Max Whittaker for The New York TimesThe San Joaquin Valley Air Pollution Control District, which includes four of the country’s six most polluted counties, has a different take. It filed a comment letter warning of “devastating federal sanctions,” including financial penalties, if the standard was toughened further.The chair of that air district is Vito Chiesa, a Stanislaus County commissioner who grows walnuts and almonds and used to lead the local farm bureau. His operation has to comply with any limitations on agriculture that might be imposed, like the prohibition on open-air burning of farm waste that the air district adopted after years of demands from public health advocates. He fears that further curbs without adequate support for smaller farmers would jeopardize his employees’ jobs.“I have like 15 employees out here, and I feel completely responsible for their families,” Mr. Chiesa said. “So how is it going to affect them? Our charge here on the air board is not to do death by a thousand cuts.”One point of agreement between proponents and many foes of a stronger standard: If the E.P.A. moves forward with tougher rules, it should also crack down on pollution sources, including railroads, ships and airplanes, under its sole jurisdiction. (The agency has proposed a stronger standard for heavy-duty trucks, around which a similar fight is playing out.)Rebecca Maurer is a City Council member representing a Cleveland neighborhood that has some of the area’s worst pollution. Her office frequently hears from constituents seeking help with housing that is safer for children with asthma, which occurs at alarming rates. The district encompasses an industrial cluster that includes two steel plants, an asphalt plant, a recycling depot, rail yards and assorted small factories.That’s the most visible source of emissions, but Ms. Maurer thinks her district’s many highways — and the diesel-powered trucks driving on them — offer the greatest opportunity for cleaning up the air, which requires state and federal action. And light manufacturing jobs are needed to employ the two-thirds of the county’s residents who lack college degrees, she said.“What we don’t want is another asphalt plant, and we don’t want e-commerce,” Ms. Maurer said. “We want something in between. We’re trying to thread this needle between these hugely polluting plants and low density, low-wage warehouse jobs.” More

  • 138 Shares169 Views

    in Economy

    Shipping Contributes Heavily to Climate Change. Are Green Ships the Solution?

    by

    On a bright September day on the harbor in Copenhagen, several hundred people gathered to welcome the official arrival of Laura Maersk.Laura was not a visiting European dignitary like many of those in attendance. She was a hulking containership, towering a hundred feet above the crowd, and the most visible evidence to date of an effort by the global shipping industry to mitigate its role in the planet’s warming.The ship, commissioned by the Danish shipping giant Maersk, was designed with a special engine that can burn two types of fuel — either the black, sticky oil that has powered ships for more than a century, or a greener type made from methanol. By switching to green methanol, this single ship will produce 100 fewer tons of greenhouse gas per day, an amount equivalent to the emissions of 8,000 cars.The effect of global shipping on the climate is hard to overstate. Cargo shipping is responsible for nearly 3 percent of global greenhouse gas emissions — producing roughly as much carbon each year as the aviation industry does.Figuring out how to limit those emissions has been tricky. Some ships are turning to an age-old strategy: harnessing the wind to move them. But ships still need a more constant source of energy that is powerful enough to propel them halfway around the world in a single go.Unlike cars and trucks, ships can’t plug in frequently enough to be powered by batteries and the electrical grid: They need a clean fuel that is portable.Ursula von der Leyen, center, the president of the E.U. Commission, stands with the captains of the Laura Maersk as well as company and government officials in Copenhagen in September.Betina Garcia for The New York TimesThe Laura Maersk is the first of its kind to set sail with a green methanol engine and represents a significant step in the industry’s efforts to address its contribution to climate change. The vessel is also a vivid illustration of just how far the global shipping sector has to go. While roughly 125 methanol-burning ships are now on order at global shipyards from Maersk and other companies, that is just a tiny portion of the more than 50,000 cargo ships that ply the oceans today, which deliver 90 percent of the world’s traded goods.The market for green methanol is also in its infancy, and there is no guarantee that the new fuel will be made in sufficient quantities — or at the right price — to power the vast fleet of cargo ships operating worldwide.Shipping is surprisingly efficient: Transporting a good by container ship halfway around the world produces far less climate-warming gas than trucking it across the United States.That’s true in part because of the scale of modern cargo vessels. The biggest container ships today are larger than aircraft carriers. Each one is able to carry more than 20,000 metal containers, which would stretch for 75 miles if placed in a row.That incredible efficiency has lowered the cost of transport and enabled the modern consumer lifestyle, allowing retailers like Amazon, Walmart, Ikea and Home Depot to offer a vast suite of products at a fraction of their historical cost.Yet that easy consumption has come at the price of a warmer and dirtier planet. In addition to affecting the atmosphere, ships burning fossil fuel also spew out pollutants that reduce the life expectancy of the large percentage of the world’s people who live near ports, said Teresa Bui, policy director for climate at Pacific Environment, an environmental organization.Cargo ships at the Port of Los Angeles in 2021 sometimes had to wait days to dock because of congestion, producing huge amounts of pollution.Coley Brown for The New York TimesThat pollution was particularly bad during the Covid-19 pandemic, when supply chain bottlenecks caused ships to pile up outside of the Port of Los Angeles, producing pollution equivalent to nearly 100,000 big rigs per day, she said.“They have been under regulated for decades,” Ms. Bui said of the shipping industry.Some shipping companies have tried to cut emissions in recent years and comply with new global pollution standards by fueling their vessels with liquefied natural gas. Yet environmental groups, and some shipping executives, say that adopting another fossil fuel that contributes to climate change has been a move in the wrong direction.Maersk and other shipping companies now see greener fuels such as methanol, ammonia and hydrogen as the most promising path for the industry. Maersk is trying to cut its carbon emissions to zero by 2040, and is pouring billion of dollars into cleaner fuels, along with other investors. But making the switch — even to methanol, the most commercially viable of those fuels today — is no easy feat.Switching to methanol requires building new ships, or retrofitting old ones, with different engines and fuel storage systems. Global ports must install new infrastructure to fuel the vessels when they dock.Perhaps most crucially, an entire industry still needs to spring up to produce green methanol, which is in demand from airlines and factory owners as well as from shipping carriers.Methanol, which is used to make chemicals and plastics as well as fuel, is typically produced using coal, oil or natural gas. Green methanol can be made in far more environmentally friendly ways by using renewable energy and carbon captured from the atmosphere or siphoned from landfills, cow and pig manure, or other bio waste.By using green methanol, the Laura Maersk could produce 100 fewer tons of greenhouse gas per day, equivalent to the emissions of 8,000 cars.Betina Garcia for The New York TimesCargo ships require fuel sources that are powerful enough to propel them halfway around the world in a single go.Betina Garcia for The New York TimesFlemming Sogaard Christensen, the chief engineer of the Laura Maersk, inside the engineering room. The ship’s engine can burn oil or a greener type of fuel made from methanol.Betina Garcia for The New York TimesBut the world today does not yet produce much green methanol. Maersk has committed to using only sustainably produced methanol, but if other shipping companies end up using methanol fuel made with coal or oil, that will be no better for the environment.Ahmed El-Hoshy, the chief executive of OCI Global, which makes methane from natural gas and greener sources like landfill gas, said companies today were producing “infinitesimally small volumes” of green methanol using renewable energy.“Companies haven’t done much in our industry yet quite frankly,” he said. “It’s all hype.”Fuel producers still need to master the technology to build these projects, he said. And in order to finance them they need buyers who are willing to commit to long-term contracts for green fuel, which can be three to five times as expensive as conventional fuel.Maersk has signed contracts with fuel providers including OCI and European Energy, which is building in Denmark what will be the world’s largest plant producing methanol with renewable electricity. The shipping company already has clients like Amazon and Volvo that are willing to pay more to have their goods transported with green fuels, in order to reduce their own carbon footprints.But many other companies are not yet willing to pay the necessary cost for greener technologies, Mr. El-Hoshy said.The missing piece, said Mr. El-Hoshy and others in the shipping and methanol industries, is regulation that would help level the playing field between companies trying to clean up their emissions and those still burning dirtier fuels.The European Union is ushering in rules that encourage ships to decarbonize, including new subsidies for green fuels and penalties for fossil fuel use. The United States is also spurring new investments in green fuel production and more modern ports through generous domestic spending programs.Maersk has clients like Amazon and Volvo that are willing to pay more to have their goods transported with green fuels, in order to reduce their own carbon footprints.Betina Garcia for The New York TimesBut proponents say the key to a green transition in the shipping sector are global rules that are pending through the International Maritime Organization, the United Nations body that regulates global shipping.The organization has long received heavy criticism for its lagging efforts on climate. This summer, it adopted a more ambitious target: eliminating the global shipping industry’s greenhouse gas emissions “by or around” 2050.To get there, nations have promised to agree on a legally binding way to regulate emissions by the end of 2025, which they would put into effect in 2027.Yet countries have yet to agree on what kind of regulation to use. They are debating whether to adopt a new standard for cleaner fuels, new taxes per ton of greenhouse gas emitted or some kind of mix of tools.Some developing countries, and nations that export low-value goods like farm products, say that strict regulation would raise shipping costs and be economically harmful.Proponents of the regulation — including Maersk — say it’s necessary to avoid penalizing those who are trying to clean up the business, and provide certainty about the industry’s direction.“There has to be an economic mechanism by which you level the playing field so that people are incentivized and not punished for using low-carbon fuels,” said John Butler, the chief executive of the World Shipping Council, which represents container carriers including Maersk.“Then you can invest with some confidence,” he added.A container ship traveling halfway around the world produce less climate-warming gas than a truck traveling across the United States.Betina Garcia for The New York TimesVincent Clerc, the chief executive of Maersk, said the company would continue to adopt new green technologies as they became available.Betina Garcia for The New York TimesStill, Maersk acknowledges that green methanol is unlikely to be the final solution. Experts say that the fuel’s reliance on finite sources of waste, like corn husks and cow manure, mean there will not be enough to power the entire global shipping fleet.In an interview, Vincent Clerc, the chief executive of Maersk, said that the entire maritime sector was unlikely to ever be powered predominantly by methanol. But Maersk had no regrets about moving some of its fleet from fossil fuels to methanol now, then adopting new technologies as they become available, he said.“This marks a real systemic change for this sector,” Mr. Clerc said, gesturing toward the vessel piled high with 20-foot containers in front of him.Eric Leveridge, the climate campaign manager for Pacific Environment, said his group was glad that Maersk and other shipping companies were moving toward more sustainable fuels. But the organization is still concerned that “it is more for optics and that the impact is potentially being exaggerated,” he said.“When it comes down to it, even if there is this investment, there’s still a lot of heavy fuel oil ships on the water,” he said. More

  • 163 Shares119 Views

    in Economy

    Mexico Is Buying a Texas Oil Refinery in a Quest for Energy Independence

    by

    President López Obrador wants to halt most oil exports and imports of gasoline and other fuels. Critics say he is reneging on Mexico’s climate change commitments.DEER PARK, Texas — Two giant murals, on storage tanks at an oil refinery here, depict the rebels led by Sam Houston who secured Texas’ independence from Mexico in the 1830s. This week those murals will become the property of the Mexican national oil company, which is acquiring full control of the refinery.The refinery purchase is part of President Andres Manuel López Obrador’s own bid for an independence of sorts. In an effort to achieve energy self-sufficiency, the president of Mexico is investing heavily in the state-owned oil company, placing a renewed emphasis on petroleum production and retreating from renewable energy even as some oil giants like BP and Royal Dutch Shell are investing more in that sector.Mr. López Obrador aims to eliminate most Mexican oil exports over the next two years so the country can process more of it domestically. He wants to replace the gasoline and diesel supplies the country currently buys from other refineries in the United States with fuel produced domestically or by the refinery in Deer Park, which would be made from crude oil it imports from Mexico. The shift would be an ambitious leap for Petroleos Mexicanos, the company commonly known as Pemex. The company’s oil production, comparable to Chevron’s in recent years, has been falling for more than a decade, and it shoulders more than $100 billion in debt, the largest of any oil company in the world.The decision to pay $596 million for a controlling interest in the Deer Park refinery, which sits on the Houston ship channel and would be the only major Pemex operation outside Mexico, is central to fulfilling Mr. López Obrador’s plans to rehabilitate the long-ailing oil sector and establishing eight productive refineries for Mexican use. Mexico also agreed to pay off $1.2 billion in debts that Pemex and Shell jointly owe as co-owners of the refinery, which is profitable.“It’s something historic,” Mr. López Obrador said last month. In a separate news conference last year, he said, “The most important thing is that in 2023 we will be self-sufficient in gasoline and diesel and there will be no increase in fuel prices.”While Mr. Lopez Obrador’s policies diverge from the rising global concern over climate change, they reflect a lasting temptation for leaders and lawmakers worldwide: replacing imported energy sources with domestically produced fuels. Further, the generally well-paying jobs the oil and other fossil fuel industries provide are politically popular across Latin America, Africa as well as industrialized countries like the United States.In the 1930s, the Mexican government took over Royal Dutch Shell’s operations south of the border as it nationalized the entire oil industry then dominated by foreigners. Now Mr. López Obrador is poised to go one step further, taking complete control of a big Shell oil refinery.The takeover is all the more pointed because it is happening in an industrial suburb that calls itself “the birthplace of Texas,” where rebels marched to the San Jacinto battlefield to defeat the Mexican Army — the event commemorated on the refinery murals. The battlefield is a five-mile drive from the refinery.It is hard to overestimate the connection between oil and politics in Mexico, where the day petroleum was nationalized, March 18, is a national holiday. Oil provides the Mexican government with a third of its revenues, and Pemex is one of the nation’s biggest employers, with about 120,000 workers. Mr. López Obrador hails from the oil-producing state of Tabasco, and the powerful Pemex labor union is a crucial part of his political base. He ran on a platform of rebuilding the company, and has raised its production budget, cut taxes it pays and reversed efforts by his predecessor to restructure its monopoly over oil production in the country.When he took office three years ago, Mr. López Obrador began undoing changes made in 2013 to the country’s Constitution intended to open the oil and gas industry to private and foreign investment. He is also pushing to reverse electricity reforms that his predecessor, Enrique Peña Nieto, put in place to increase the use of privately funded wind and solar farms and move away from state-run power plants fueled by oil and coal.Energy experts say Mexico is backtracking on a commitment it made a decade ago under President Felipe Calderón, to generate more than a third of its power from clean energy sources by 2024. Mexico now produces just over a quarter of its power from renewables.“They are going to heavier fuels rather than to lighter fuels,” said David Goldwyn, a top State Department energy official in the Obama administration. “Virtually every foreign company — Ford, Walmart, G.E., everybody who operates there — has their own net-zero target now. If they can’t get access to clean energy, Mexico becomes a liability.”Mr. López Obrador’s government has said it will combat climate change by investing in hydroelectric power and reforestation.Many of the Mexican president’s initiatives are being contested by opposition lawmakers and the business community. But Mr. López Obrador can do a lot on his own. He plans to spend $8 billion on a project to build an oil refinery in Tabasco state, and more than $3 billion more to modernize six refineries.President Andres Manuel López Obrador hails from the oil-producing state of Tabasco, and the powerful Pemex labor union is a crucial part of his political base.Gustavo Graf Maldonado/ReutersThe purchase of the Deer Park refinery is crucial to his plans because the Tabasco complex will not be completed until 2023 or 2024 and will not produce enough gasoline, diesel and other fuels to meet all of Mexico’s needs.Long a partner of Pemex, Shell, which operates the Deer Park refinery, is selling its stake in part to satisfy investors concerned about climate change who want the oil giant to invest more in renewable energy and hydrogen.Under Mexican ownership the refinery will continue its practice of using Mexican crude oil, but it will probably sell more of the gasoline and other fuels it produces to Mexico. In the future, some energy experts said, Pemex could also use the Deer Park refinery to process oil from other countries that also produce the kinds of heavy crude that Mexico does.“I think it’s a good deal and makes sense for Pemex,” said Tom Kloza, global head of energy analysis at Oil Price Information Service, who noted that Deer Park could perhaps process Venezuelan oil if the United States lifted sanctions against that country.The Mexican policy changes would have only a modest and temporary impact on American refineries, which can replace Mexican oil with crude from Colombia, Brazil, Saudi Arabia and Canada. Refiners could lose as much as a half-million barrels of transportation fuel sales a day to Mexico, but energy experts say refiners would be able to find other markets.Guy Hackwell, the general manager of the Deer Park complex, said, “Best practices will remain in place.” He said the “vast majority of the work force will report to the same job the day after the deal closes.”As for the murals, a Pemex spokeswoman, Jimena Alvarado, said, “We would never remove a historical mural.”Residents in Deer Park, in the heart of the Gulf of Mexico petrochemical complex, say they feel assured that locals will run the plant and Shell will continue to own an adjoining chemical plant. “The phone numbers will remain the same for who we contact in the event of an emergency and we will still have the same people and relationships, so I feel good about that,” Deer Park’s city manager, Jay Stokes, said.But some energy experts said Mr. López Obrador’s approach to energy, including the refinery purchase, would waste precious government resources that could be better used to reduce greenhouse gas emissions and local air pollution. There are also doubts that Mexico can build enough refining capacity to fulfill the president’s objectives.Shell, which operates the Deer Park refinery, is selling its stake in part to satisfy investors concerned about climate change who want the oil giant to invest more in renewable energy and hydrogen.Brandon Thibodeaux for The New York TimesJorge Piñon, a former president of Amoco Oil de Mexico, said Mexico most likely would not be able to immediately profit from slashing exports of crude and processing its own fuels since the refinery business typically has low profit margins, especially in Latin America.He said the Mexican refineries could not match American refineries in handling Mexico’s high-sulfur heavy crude. Mexican fuels made from heavy oil caused severe air pollution problems in many cities before the country began importing cleaner-burning American gasoline and diesel over the last 20 years.By exporting less oil, Mexico would also almost certainly use more of it for domestic power generation, potentially pushing out solar and wind generation and producing more air pollution and greenhouse gas emissions.“His nationalistic decisions will have a negative impact on climate change,” Mr. Piñon said. “He is marching back to the 1930s.”Mr. López Obrador is unapologetic. “Oil is the best business in the world,” he said at a news conference last May. More