Canada

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Willett co-authored a new study looking at the Planetary Health Diet (PHD) — which he helped develop in 2019 as part of the EAT-Lancet Commission — and its effects on mortality.

The new study, published in the peer-reviewed American Journal of Clinical Nutrition, looked at decades of diet data from more than 200,000 health-care workers in the United States.

The new study also found that adhering to the PHD came with a lower environmental impact, based on calculations that foods in this diet would emit fewer greenhouse gases, require less water, fertilizer and crop land.

"That's huge," Willett told CBC News from Cambridge, Mass., "Because it really means that we could allow some of our cultivated land to go back to forest … which would definitely help stabilize the global climate situation."

Climate change, driven largely by the burning of fossil fuels, is also exacerbated by agricultural emissions, which include methane, a shorter-living but more potent greenhouse gas.

A negative feedback loop occurs as food production is then threatened by drought and other extreme weather events, strengthened and lengthened by climate change.

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