U.S. emissions of planet-warming greenhouse gases are projected to decline in the next several years after passage of legislation subsidizing renewable energy, the United Nations said, but global action remains too limited to slow climate change.
The gap between cuts pledged by 166 nations, including the U.S., and their current emissions puts the world on track to warm 2.5 degrees Celsius, or 4.5 degrees Fahrenheit, by the end of the century, a U.N. report released on Thursday estimated.
To forestall the worst effects of climate change and hold warming to 1.5 degrees Celsius above preindustrial levels, nations must cut their use of fossil fuels by 45% by 2030, the report said.