Nordhaus, Robert

Economists have been examining the impact of climate change for almost as long as it’s been known to science.In the 1970s, the Yale economist William Nordhaus began constructing a model meant to gauge the effect of warming on economic growth. The work, first published in 1992, gave rise to a field of scholarship assessing the cost to society of each ton of emitted carbon offset by the benefits of cheap power — and thus how much it was worth paying to avert it.Dr. Nordhaus became a leading voice for a nationwide carbon tax that would discourage the use of fossil fuels and propel a transition toward more sustainable forms of energy. It remained the preferred choice of economists and business interests for decades. And in 2018, Dr. Nordhaus was honored with the Nobel Memorial Prize in Economic Sciences.But as President Biden signed the Inflation Reduction Act with its $392 billion in climate-related subsidies, one thing became very clear: The nation’s biggest initiative to address climate change is built on a different foundation from the one Dr. Nordhaus proposed.Rather than imposing a tax, the legislation offers tax credits, loans and grants — technology-specific carrots that have historically been seen as less efficient than the stick of penalizing carbon emissions more broadly.The outcome reflects a larger trend in public policy, one that is prompting economists to ponder why the profession was so focused on a solution that ultimately went nowhere in Congress — and how economists could be more useful as the damage from extreme weather mounts.A central shift in thinking, many say, is that climate change has moved faster than foreseen, and in less predictable ways, raising the urgency of government intervention. In addition, technologies like solar panels and batteries are cheap and abundant enough to enable a fuller shift away from fossil fuels, rather than slightly decreasing their use.Robert Kopp, a climate scientist at Rutgers University, worked on developing carbon pricing methods at the Department of Energy. He thinks the relentless focus on prices, with little attention paid to direct investments, lasted too long.“There was an idealization and simplification of the problem that started in the economics literature,” Dr. Kopp said. “And things that start out in the economics literature have half-lives in the applied policy world that are longer than the time period during which they’re the frontier of the field.”Carbon taxes and emissions trading systems have been instituted in many places, such as Denmark and California. But a federal measure in the United States, setting a cap on carbon emissions and letting companies trade their allotments, failed in 2010.What’s in the Inflation Reduction ActCard 1 of 8What’s in the Inflation Reduction ActA substantive legislation. More