Lobal Warming Is it the Biggest hoax we have ever faced?

In my thesis i would like to show how global warming could be a hoax.
There is no solid proof that global warming is man made, but rather that we affected by outside forces.
Then i would like to show how this hoax has enabled us to create a massive new industry. Carbon trading, green technology etc. creating loads of jobs.
I have studied for a BBA therefore i need to show more of the business side.

Please use as many sources as possible