Carl Sagan's 1985 Congressional Testimony on Climate Change
carlsagandotcom · Talk · 17 min · 2021 · YouTube title: Carl Sagan testifying before Congress in 1985 on climate change
Why it's here
HN commenters use it as proof that the climate problem was clearly explained decades ago, and as a model of clear communication to a broad audience.
What it covers
Carl Sagan's December 1985 testimony to Congress on the greenhouse effect, about 15 minutes long. He lays out CO2 warming, the risk of runaway effects and the danger of continued coal burning.