The facts are that C02 and other greenhouse gases are rising, the poles are melting and warming and sea levels are rising, and no-one has yet come up with a better theory than global warming to explain it. Don't like the man-made hypothesis? Think the last 200 years of belching greenhouse gases into the atmosphere and rising temperatures is a coincidence?

Fine, then let's have a better theory, based on accepted facts. Nothing else can be taken seriously.

"Burden of proof" is required if you don't have a better theory.