How is global warming a man made disaster?

Global warming is caused by the burning of fossil fuels (coal, oil and natural gas) in industry, transport and the generation of electricity, which releases carbon dioxide (CO2). Deforestation is another cause. Man is responsible for both of these. Carbon dioxide builds up in the atmosphere absorbing heat. This is the greenhouse effect. We now have an enhanced greenhouse effect which is warming the planet and causing climate change. This is a disaster.