You are playing fast-and-loose with the words "all" and "fact", which seems to be the standard mode of operation for left-wing nutjobs. The facts are: 1. We have a lot of evidence suggesting that climate change is happening. 2. We have some evidence that human pollution has caused some of the symptoms of climate change. 3. We also know for a fact that the overall climate of the earth has changed and fluctuated to extremes without the help of humans, in FACT, before humans even existed.