Recent pledges by the United States and other nations could help cap global warming at 2 degrees Celsius (3.6 Fahrenheit) by the end of the century, but only if goals to reduce greenhouse gas emissions to “net zero” by 2050 succeed.
More than 190 countries agreed in Paris six years ago to keep average temperature increases below that level — ideally no more than 1.5 C (2.7 F) — by 2100 compared to pre-industrial times.
The Climate Action Tracker, compiled by a group of researchers who translate emission pledges into temperature estimates, projects that the world is currently set to overshoot the Paris accord’s target by 0.9 degrees.
But if 131 countries that make up almost three-quarters of global emissions meet their pledged or discussed “net zero” goal, then the 2-degree target could be met, said Niklas Hoehne of the New Climate Institute. That’s 0.1 C cooler than the previous optimistic forecast the group made in December.
