As the climate is always changing, and Mr. Hockey Stick says it's man doing it. how much is man doing it and how did he prove that?
If climate change is accelerating because of what man is doing, how much acceleration can they account for? In what way did they come up with their numbers?
Rather than telling me all about the end of days, tell me about real science and hard numbers please.
This is an interesting question that a lot of the evangelists don't know. In interviews and debates, it's a good question to ask.
The answer is: about 1/3 of the noted increase in temperature is directly due to humans, about 1/3 is the result of natural variation, and 1/3 is unaccounted for.
Of course this is a statistical measure, sort of like trying to determine whether throwing 4 heads in a row was a fluke or an indication of a trend, but it's the best answer we have with our current understanding and datasets.
It's interesting to point out the differences between science and, for example, religion.
How does religion typically deal with sceptics and dissenters? Usually with scorn, derision, excommunication, and occasionally death. In the bible it says "shall not suffer a witch to live", and so on.
Science is the complete opposite of religion. Scientists would never ostracise, belittle, or spew hatred on sceptics, would never blackball, blackmail, or threaten other scientists, would never cause them to lose income or hold an undergraduates' opinions hostage as a condition for getting a degree.
So when you read that 97% of scientists believe in global warming, you can tell that they come to that opinion honestly, and without coercion from other scientists.
Science is completely unlike religion.