The smallest hint of frustration had crept into John Kerry’s voice. We were talking about international climate diplomacy, which for the past two years has been Kerry’s job as the U.S. special presidential envoy on climate, a role President Joe Biden created to signal his commitment to the issue. Kerry’s last day is Wednesday, and when we spoke a couple of weeks ago, I asked him why the United States—historically the largest emitter of greenhouse gases—had pledged a paltry $17.5 million to a new fund for countries suffering the worst effects of climate change. “Our politics are embarrassing,” he said. “Congress zeroes out things that have climate beside it. And so the reason of the 17.5 is that’s all that was appropriated.” His frustration is well founded. Kerry was in his first Senate term in 1988 when congressional testimony by James Hansen and other scientists landed climate change on the national agenda; decades later, U.S. emissions are starting to creep down, but the U.S. just had the most intensive year for oil production it ever …