Al Gore (and others probably) was predicting the climate changes that we see today unless we act, but the people that were placed in the political positions to help this coming crisis didn't believe him and the scientists and so here we are at a potential irreversible climate situation that we caused (according to scientists).
And I guess we can hope to escape earth and live on Mars, but that doesn't really sound realistic and a lot of people are going to die trying to make that happen, if it ever does.