The Earth's climate has changed in the past but this was...
Climate change and global warming are both total nonsense and drivel concepts.
There is simply not enough CO2 in the atmosphere to cause any dramatic climate change. The Earth's climate has changed in the past but this was due to volcanic activity. Volcanoes can expell a thousand times more CO2 than what humans can achieve. A volcanoe expells other sulpher based gases which cause a shielding effect in the upper atmosphere. This is what happened during the Dark Ages when sunlight was reduced and a mini ice age occurred. Human's are like microscopic organisms on the surface of the Earth. Our combined mass is insufficient to be able the affect the huge mass of the Earth. This is just a matter of understanding basic heat transfer science in relation to two objects of dissimilar size and mass.