Losing more ground in the fight against climate change, humanity is heading for a hotter world than experts projected last year — and the United States is a big reason for that, a new United Nations report says.

If all the countries do what they promise to reduce heat-trapping emissions, Earth will likely still warm another 2.2 degrees Fahrenheit (1.2 degrees Celsius) above current temperatures, according to Wednesday’s update of climate calculations by the United Nations Environment Programme. That’s about two-tenths of a degree Fahrenheit (0.1 degrees Celsius) more than last year’s projections by the same science team.

“This is a worse outcome than expected last year, as a result of the formal withdrawal of the United States of America from the Paris Agreement and revised estimates of historical emissions,” the report said.…