To be fair, he didn't specify WHICH decade. He could still be correct. One of the all-time biggest scams in US history. He made 10s of millions off of his joke of a movie and literally none of the 'end of the world' predictions have come true. Just keep moving the goalposts every time one of his 'facts' is disproven.
The climate is changing, no doubt, as it always has for literally billions of years. Mankind needs to be better at keeping our air, water, soil clean. But, destroying all of Western civilization for limited impact on an ecosystem that is almost assuredly infinitely more reactive to natural changes is insanity. Someone needs to explain to me how more CO2, which plants require to exist, is killing the planet. Biology 101 would suggest that an environment richer in CO2 would make the earth even more fertile and increase plant life. And that's bad how...?