While the earth is going through a warming bit because of the cooling/heating cycle, like matthewg said, its been proven that humans have helped play a part in it being accelerated.
It may be true that lots of people "accept" that the warming is manmade, it certainly hasn't been "proven." You'll recall that the scientific method requires experimentation, not just noticing that two things are correlated. Just because you heard from someone who heard from someone that it's "proven," doesn't mean that it was.
Thanks for pointing out that science knows that correlation isn't causation.
Thanks for playing.
Have a blast, anon!