A new preliminary report from the Rhodium Group, a private energy research firm, shows that American greenhouse gas emissions dropped by 2.1% in 2019.

The dip has been credited to the increased use of natural gas instead of coal to produce electricity.

Last year, coal-fired power generation dropped 18% to its lowest level since 1975 while the average annual price of natural gas dropped 20%, making it the cheaper, cleaner-burning alternative.

Criticism of the report notes that while emissions are down, Trump is still the president.