Climate pollution in the US is up under Donald Trump and threatens to undermine international efforts to stall the crisis, especially if he wins re-election this year and secures a second term in the White House.

While US climate emissions fell 2.1% in 2019, they rose significantly in 2018, according to estimates from the economic analysis firm Rhodium Group. On net, emissions are slightly higher than in the beginning of 2017, when Trump’s administration began enacting dozens of environment rollbacks aimed at helping the oil and gas industry.

Trump is still working to further…