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Carl Sagan testifying before Congress in 1985 on climate change

carlsagandotcom4 HN recommenders · recommended in 4 months, 2021–2026
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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.

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.

12 comments from Hacker News

@agentultra2023-01 · in “Revealed: Exxon made ‘breathtakingly’ accurate climate predictions in 70s & 80s”

The address Carl Sagan made in 1985 is well worth watching for those who remember those times and especially for those who weren't alive back then [0] People knew about this before you were born and decided their best interests were more important and they acted in wilful disregard for your life and the lives of everyone on this planet. They weren't ignorant. No facts were hidden from them that they could be forgiven for being misinformed. They knew with certainty what the science was revealing and spent money to discredit the science, cut funding to their own researchers, bought politicians, funded PR campaigns, and continued building their fossil fuel empires. Everything Carl Sagan said in that address has come to pass. It's wild to watch. [0] ▶ this video

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@melling2023-03 · in “Trees Across the U.S. Are Sprouting Leaves Earlier Than Usual This Year”

Time to watch Carl Sagan, almost 50 years ago, explain how our coal usage would be a big problem: ▶ this video A slow train wreck that was avoidable.

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@YellowStuDregg2022-08 · in “Climate endgame: exploring catastrophic climate change scenarios”

A quick google search gives us plenty of past published projections and how they fared: link You can also watch Carl Sagan break it down in front of congress back in 1985 for just 15 minutes of your time ▶ this video

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@andersonmvd2022-01 · in “Nuanced communication usually doesn't work at scale”

Look at how many details this guy (Carl Sagan) conveyed in his 15' speech: ▶ this video in a way that potentially everyone understood. I wonder if every explanation was like his, if nuance wouldn't be well communicated, even to large groups.

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@metobehonest2026-03 · in “Thoughts on Slowing the Fuck Down”

>If doomers were good at predicting these events and how it will play out they'd all be rich as hell, but no, they are for the most part a bunch of broke whiners. Oh, the classic "if you're so smart then why aren't you rich" non argument. I'm sure Carl Sagan was a just whiny loser because he didn't figure out how to become a billionaire from knowing how physics works. His prediction that the planet would warm several degrees by the mid to late 21st century failed to reward him what he was owed. By the way we haven't even gotten halfway there yet, so your "shifting goalposts" thesis is null. People who push dangerous neoliberal propaganda like carbon capture or "infinite growth on a finite planet is possible" on the other hand do get very rich, and they don't even need to make good predictions. Such is the planet governed by pedophiles. ▶ this video