What is the purpose of discussing this here when you have got illiterate ignoramuses arguing Climate Change is a hoax?
Climate change is a natural occurrence on the planet earth which takes place over thousands or millions of years. The primary cause of climates and their change on earth is 1) the sun, 2) the sun, 3) the sun, 4) level of ice caps which effects global water flow - which can be attributed to the sun.
Earth has gone through an incredibly wide range of average climate temperatures through out its history. Most recently the 'little ice age' in the medieval era and the end of the ice age in 12,000BC - which spawned an era of gradual global temperature increases.
The fact is, not only has ice caps increased tremendously in size within the last decade - as discovered by NASA (but ignored by the MSM), but avg global temperatures have not budged in any significant way for the last 50 years.
Man made global warming will go down as the greatest corruption of science in history - fueled by money and politics being mixed in with science.