Grist: After the latest Democratic presidential debate on Thursday, Hillary Clinton told an activist with 350.org that she supports banning fossil fuel extraction on public lands. Its a done deal, she said. And when asked a follow-up question, she continued, Thats where the president is moving. No future extraction. I agree with that. The activist, quite literally, cheered. That cheer might have been a tiny bit premature. Clintons quick comments hardly amount to a clear policy proposal. She said...