Clinton staked her climate record on what’s widely perceived to have been one of the biggest diplomatic failures in recent history—the Copenhagen climate summit in 2009. After years of anticipation, the meeting of world leaders ended in disarray, with Obama and his aides famously wandering around the convention center, looking for the leaders of China, India, Brazil, and other key nations. The toothless deal struck at the last minute was called a “grudging accord” by the New York Times the next day. Yes, Obama—and Clinton, then his secretary of state—were instrumental to that deal, but it’s hardly something Hillary should be proud of.
In reality, the sour legacy of Copenhagen has haunted international climate negotiations ever since. It’s now widely believed that the U.S. never wanted a legally binding climate deal in Copenhagen at all—even though the Democrats controlled the Congress at the time and may have been able to successfully ratify the treaty—opting instead for a mostly empty pledge of billions of dollars in aid to developing nations. Among environmentalists, Clinton has retained only a mediocre reputation on climate change as a result.