United Nations Secretary-General Antonio Guterres wants governments to make more ambitious pledges to cut emissions at the U.N. summit on September 23. UN chief has convened the summit to boost the Paris Agreement ahead of a crucial implementation phase next year.

Current pledges by governments to cut emissions are nowhere near enough to meet the Paris target of keeping the rise in average global temperatures to well below two degrees Celsius, with a goal of limiting warming to 1.5 degrees Celsius.

And in a flurry of tweets, U.S. President Donald Trump confirmed he will revoke California’s authority to require automakers to build cleaner vehicles than federal requirements demand.

Trump’s action came on the same day teenage climate activist Greta Thunberg was addressing the U.S. Congress and urging lawmakers to treat climate change “as the existential crisis it is.”


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