Last night’s climate town hall was seven hours long. You can be forgiven for not watching the whole thing; I didn’t. But if you tuned in for a two-hour stretch in the middle, you got to see the Democratic primary race’s three top contenders — Joe Biden, Elizabeth Warren, and Bernie Sanders — lay out their visions for how to solve the climate crisis. And they were very different visions.

Biden promised a return to the old status quo. Warren promised carrots and sticks to make corporations behave more sustainably. And Sanders promised to wrest control of the future from for-profit interests. The clock is ticking, and the choice is clear.

Joe Biden struggled through his segment, mashing folk-isms together and trailing off per usual. But somewhere amid the endless string of non sequiturs, a stance on climate change did emerge. Biden appears to believe that Donald Trump is responsible for bringing the world to the brink of irreparable environmental destruction, and that the primary task of his successor is to undo the damage Trump has done.