The first treaty to address climate change was negotiated by scientists and diplomats at the United Nations in 1992. This was a breakthrough that brought the topic to the forefront, and it led to a series conferences that were held almost every year for the next thirty years.

Emily Kwong, host of Short Wave, talks to Dan Charles, a freelance climate reporter about how the conference’s attendees set a clear, ambitious goal that they didn’t fully grasp.

Send an email to shortwave@npr.org.