A line chart showing projected U.S. greenhouse gas emissions under select scenarios. Under business as usual, emissions are expected to decline from 5.4 billion metric tons of CO2 equivalent in 2021 to 5 billion tons in 2030. Under the Inflation Reduction Act, emissions are expected to decline to 4.1 billion metric tons in 2030. Under the Paris Agreement pledge, emissions are expected to decline to 3.3 billion metric tons in 2030.