planet. >> the global-climate crisis is a key issue for, both, the g7 summit and the upcoming-nato summit on monday. meantime, there's more than enough evidence we are in a race against time. in the southwest u.s., drought conditions are, already, bad, and getting worse. water levels, at lake mead, the nation's largest reservoir, hit their lowest mark since the lake was created back in the 1930s. cnn's chief climate correspondent, bill weir, joins me now. bill, good to see you. let's start with the g7 and nato meetings. are world leaders thinking big enough about what they could do right now to slow human impact on the planet? >> i think, if we put that question, pamela, to, you know, the 98% of climate scientists who think this is an emergency, i think they would, resoundingly, say no. nobody's talking about this issue with the urgency, that it deserves. because unfortunately, we are set up on four-year election cycles. our quarterly returns for