For what seems like the last 100 years, we've had every environmentalist, government bod, and random freak bleating at us about how we're destroying the ozone layer, and that the icecaps will melt and we'll all die and lalalala, let's stop eating the lovely animals and all go hug some fucking trees.

So near enough the whole bastard world buys into the propaganda, pulls their collective socks up and become environmentally friendly. Vast amounts of money are spent to convince us all that this is good.