Fact obviously!
But we've had warmer climates and survived. Co2 will have an affect, as you said on the ozone layer. Obviously it's not just human's causing this rise in temperture because more is relised from volcaones and the oceans that from humans. But we shouldn't just dismiss global warming, because it obviously does exist. Not only will it cause rise in sea levels but increase in natural hazards such as hurricanes becuase of an increased tempature, therefore warmer oceans.
So honestly, it is something we should at least consider!