President Obama may be on the way out, but he's not done yet.
Using a 1950s-era law called the Outer Continental Shelf Act, the President effectively banned oil and gas drilling on 115 million acres of federal waters off Alaska and 3.8 million acres in the Atlantic on Tuesday. The sweeping policy affects waters from Alaska to New England and all the way down to the Chesapeake Bay.
The move is widely seen as Obama's attempt to solidify his environmental legacy before Donald Trump moves into the White House.
Back in September, the U.S. officially adopted the Paris Agreement, the most ambitious climate change treaty in history with 118 countries signing on. At the time, Obama referred to the accord as "the moment we finally decided to save our planet."
A year earlier, the President enacted the Clean Power Plan, which was intended to cut pollution from the power sector by 30% and reduce pollution that leads to soot and smog by over 35% by 2030.
Of course, fighting climate change has always been at the top of Obama's agenda. And, that's the area most in jeopardy with Donald Trump waiting in the wings. President-elect Donald Trump has vowed to undo nearly all of these policies, and that's why Obama is doing all he can to cement his environmental agenda before leaving the Oval Office.