Global warming is a scam. There are temperature fluctuations, but there is no proof that they are caused by man. The surface temperatures of Mercury and Venus are increasing at the same rate as that of Earth. Increased sunspot activity is the likely cause. As it stands "Global Warming" is just a scam to get "Carbon Taxes" passed. Think about it. Every living thing on our planet is carbon based. They do not care about the environment. If they did, they would not sell carbon credits, which are, in effect, a liscense to pollute(if Co2 was a pollutant, which it is not).