“Policies to combat the climate crisis or any other symptoms should address their root cause: human overexploitation of the planet.” They said increasing ocean deoxygenation and warming waters were threatening warm-water coral reefs, upon which half a billion people rely for food, income and storm protection. Both ocean heat and global sea levels set new records since 2019, and the annual loss rate of the Brazilian Amazon reached a 12-year high in 2020. Echoing previous research, they said that forest degradation linked to fire, drought and logging was causing parts of the Brazilian Amazon to now act as a source of carbon, rather than absorb the gas from the atmosphere. Livestock such as cows and sheep are now at record levels, numbering more than four billion and with a mass exceeding that of all humans and wild land mammals combined, they said.
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