Amna Nawaz:

By almost any measure, 2019 was a year of especially sobering news about climate change, not only because of new findings and grim warnings about what could happen, but because some — of some extreme weather events happening now.

It was also a year where a movement grew from the ground up to try and tackle the problem.

But, as Miles O'Brien explains, the call for action was often divorced from political reality. His report tonight is part of our regular coverage of the Leading Edge of Science.