How silly. IF, and I do mean IF, it gets that bad, lots of folks will start to die off in mass number. Fewer people, less pollution. Fewer cities, fewer factories, and the problems will get less and the Earth recover. Famines, wars, and plagues will reduced the population from 7 Billion to one or 2 Billion. Fewer people will mean less ecological problems.
And then the idiots will realize this has nothing to do with people.
By then we will be living underground.