In 1992, diplomats and scientists at the United Nations negotiated the first-ever treaty intended to tackle the climate change. This brought the issue to the forefront and led to a series of conferences that have occurred almost every year for the next 30 years. Short Wave host Emily Kwong talks to freelance climate reporter, Dan Charles about how those at the conference wrote a clear and ambitious goal that they didn't even fully understand. Plus — why it rattled the fossil fuel industry. This is part 2 of a two-part series. For part 1, check out "A Climate Time Capsule (Part 1): The Start of the International Climate Change Fight"Email Short Wave at ShortWave@NPR.org.