Global warming. Not everyone seems to agree on that. Personally, I think there is enough proof that burning fossil fuels enhances the greenhouse gas effect.
But aside form global warming, there are a lot of other man-made problems with the environment. Deforestation, over-fishing, toxic chemicals needlessly dumped in the open, industrial farming, and yet everyone is still arguing wether glabal warming is hapening or not. And even then, we can see that we are polluting the atmosphere without needing to prove it scientifically. Smog is proof, and in downtown big cities, you can usually smell the fumes.
So why don't we just try to clear up anyways, even if we don't agree over global warming. Why don't we try to stop over-fishing and deforestation, industrial farming and chemical dumps? And if clearing all that up doesn't change anything, then fine, I will admit that there was nothing wrong. But it seems that the experiment I am proposing here can only be for the best.