[Nono]

tivo, sweetie, you and your fellow bitter-end doubters are free to doubt as much as you like. I'm of a skeptical disposition myself.

But the evidence is squarely against you, i.e. while it's theoretically possible that all this has nothing to do with human activity, the scientific community thinks that such highly theoretical mental gymnastics are a mighty stretch. No absolute proof is possible? No absolute proof is possible of a whole range of scientific verities, but if it walks like a duck and quacks like a duck, it is (all give-me-proof aside) probably a duck.

And here's why people like you have an interest in taking the blinders off: By treating it as human-generated, you might just avoid the worst effects. But if you don't treat it that way and you're skepticism proves unfounded (extremely likely) you're screwed.

That's why.