"I Never Said Plant A Trillion Trees" - Co-Author Of Study Noting Space For A Trillion Trees
Tomas Crowther understands more than most the danger of simple, optimistic messages about combating the climate crisis. In July 2019, the British ecologist co-authored a study estimating that Earth had space for an extra trillion trees on land not used for agriculture or settlement. Its implications were intoxicatingly hopeful. By restoring forests in an area roughly the size of China, the press release accompanying the paper suggested two-thirds of all emissions from human activities still present in the atmosphere could be removed.
The study, led by Jean-François Bastin, a postdoctoral researcher at Crowther’s lab in ETH Zürich, Switzerland, was the second most featured climate paper in the media in 2019, according to one analysis. It inspired the World Economic Forum’s (WEF) One Trillion Trees Initiative, launched last year after Salesforce billionaire Marc Benioff read the paper on the recommendation of Al Gore, the former US vice-president. The Time magazine owner told everyone he could about the research: chief executives, friends and world leaders, even convincing climate sceptic Donald Trump to back the WEF initiative with a multibillion tree commitment.
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The science behind the press release’s claim that new forests could suck in two-thirds of all historic human emissions remaining in the atmosphere was also questioned. In May 2020, the study’s authors made three corrections, including an acknowledgment that they were incorrect to state “tree restoration is the most effective solution to climate change to date”, and clarifying that new forests could absorb about half as much carbon from the air as the paper initially appeared to suggest.
They had already issued a lengthy response to criticisms in the journal Science, explaining that they did not mean reforestation was a potential magic bullet or a substitute for reducing fossil fuel use. Reforestation was a potent tool for climate crisis mitigation, just less so than initially suggested, and certainly not a replacement for decarbonisation. “We messed up the communications so badly,” Crowther says, clearly wounded by the backlash. He takes “full responsibility” for the failures, and, with a team of researchers, has been re-doing the analysis with a different approach.
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https://www.theguardian.com/environment/2021/sep/01/ive-never-said-we-should-plant-a-trillion-trees-what-ecopreneur-thomas-crowther-did-next-aoe
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