Ask anyone anywhere what’s the leading cause of global heating and they’ll tell you: fossil fuels. But what if we’re all wrong?

Gerard Wedderburn-Bisshop is a scientist for the World Preservation Foundation and worked as a Principal Scientist with Queensland Government Natural Resources, using satellite data to monitor three decades of vegetation cover and broadscale deforestation. In February 2025, he released a paper showing how the IPCC is using different models to calculate the emissions from fossil fuels and animal agriculture. Gerrard researches shows, when we use the same model for both, animal agriculture becomes the biggest driver of global heating.

In this episode, Gerard explains his research and other problems with emissions calculation, including how deforestation is disregarded and methane is misrepresented. He calls all of this inconsistent emissions accounting—and it could be leading policy-leaders astray.

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