The UK has declared a climate emergency, but what are the quickest solutions to drive down greenhouse gas emissions enough to keep global warming below 1.5 °C? A report published by Harvard University suggests the answer could lie in the reforestation of farmland currently used to raise livestock, and examines two possible scenarios.

Returning pastureland back to forest, as in the first scenario, would soak up CO2 equal to 12 years of the UK’s current emissions, according to the authors of the report, Helen Harwatt and Matthew Hayek. The second scenario trades off some of the CO2 removal ...


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