With the third executive order of his new administration, President Joe Biden said the United States would join the Paris Agreement. Originally finalized in 2015, the climate change deal saw 143 countries, including the United States, agree to limit global temperature rise to less than 2 degrees Celsius. The United States, under then President Obama, joined the deal without a Congressional vote, which left the door open for his successor to abandon the treaty in the same way.
And that’s exactly what President Trump did when he ad the United States planned to withdraw from the agreement in 2017, calling it “unfair” at the time. In 2019, the administration launched the formal process quit the deal. The timing of everything worked such that the process would not be complete until the day after the 2020 election, allowing another president, if elected, to join the deal.