Jesus Christ you act like a fucking child ... why, but why, but why, but why!
We live in a finite space called the biosphere. We are adding pollutants that cause more of the suns energy to stay within the biosphere resulting in an increase in temperature.
The idea that we have no impact on the biosphere is, well I can't quite find the words to describe the level of delusion that is necessary to deny we have an effect. Fly above the nation at night and tell me we have little effect as you can hardly find a place free from light -- unnatural light! We've moved mountains and split the atom and will, in a comparatively short span of a few centuries, exhaust the supply of sequestered carbon in the form of fossil fuels. A supply that took half a billion years to produce.
There are, of course, other forces at work that provide camouflage for the deniers. Volcanic releases, contribute significant CO2 and in a billion years the suns output will have increased enough to make life on Earth unlivable.
We should do more to forestall the day when the Earth becomes unlivable.