>> narrator: at exxonmobil, under a new c.e.o., rex tillerson, they had now made a public acknowledgementt the same time, they were still raising the uncertainties and funding groups who disputed the scientific consensus. >> i don't, i don't really read that, and when i read what these groups are publishing, what they're examining are holes in the science, gaps in the science, things that don't have a good scientific basis. >> under rex tillerson, what they said was, "we just don't know, and do we really want to overturn our economies and upend things to address growing co2 levels, when we just don't know?" >> as i said earlier, i think having a good debate on this is what's sorely needed. and this rush to everyone wanting to say, "we got it figured out," that's just... i hate to say it, but that ain't so. >> and the oscar goes to "an inconvenient truth." davis guggenheim. >> narrator: in 2006, al gore's film "an inconvenient truth" sounded the alarm to a widening audience, warning of a "planetary emergency." >> all over the world, we need to solve the climate crisis. we have everything w