Zeke Hausfather and Devin Rand in the Climate Brink:
Last September the Washington Post published an article about a new paper in Science by Emily Judd and colleagues. The WaPo article was detailed and nuanced, but led with the figure above, adapted from the paper.
The internet, being less prone to detail and nuance, ran with the figure, with climate skeptics calling it their “new favorite graph” and reposting it everywhere, claiming that it shows the insignificance of recent human warming relative to the Earth’s long temperature history.
The furor over the graph reached its apogee in January when Joe Rogan showed it in a podcast interview with Mel Gibson, saying that “If you believe these silly people, way before human beings had ever existed, there’s always this rise and fall. And this idea that the whole thing is based on carbon emissions from human beings is total bullshit. It’s not true. Right. We might be having an effect, but we’re having a small effect, a very small effect.”
So we decided we’d do the barest amount of actual diligence on the claim. We read the actual paper (non-paywalled version here). And, lo and behold, we found that rather than dismissing the role of CO2 on longer-term changes in the Earth’s climate, it makes one of the strongest claims yet that “CO2 is the dominant driver of Phanerozoic climate [the past 485 million years], emphasizing the importance of this greenhouse gas in shaping Earth history.” The authors even express surprise that CO2 explains so much of the apparent temperature variation, and that solar variability does not have as dominant an effect.
Continue reading “Climate Denier’s New Favorite Graph Doesn’t Say What they Think it Says”




