'It is this simple': Biden's climate summit plea

Nearly 90 countries have joined a U.S.- and EU-led effort to slash emissions of methane by 2030 from 2020 levels, a senior Biden administration official said ahead of the formal announcement.

While major powers have traded blame for the world's inability to agree on rapid reductions in the use of fossil fuels to limit global warming to manageable levels, there are signs of resolve in other areas.

Among the signatories is Brazil - one of the world's five biggest emitters of methane, which is generated in cows' digestive systems, in landfill waste, and in oil and gas production. Three of the others - China, Russia and India - have not signed up, while Australia has said it will not back the pledge.

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