The climate crisis is moving squarely to the center of attention in a series of televised town halls with top Democratic presidential candidates.
Former Housing Secretary Julin Castro was the first of 10 presidential hopefuls speaking in a marathon seven-hour series of separate town halls on CNN.
Castro told questioners including a high school student and nurse that he wouldn't immediately ban oil and gas production by fracking but would take other steps to eliminate fossil-fuel emissions by 2045.
President Donald Trump began tweeting as soon as the prime-time climate forum kicked off.
rump says Democrats' proposals would raise energy bills and gas prices.
he forum gives Democrats a chance to carve out space from other contenders on a subject of growing importance to Democratic voters.