Global Warming -- Fact?

The proposed law on dis information sets up two levels of free speech;

1) Academics, press and government agencies can say what they want.
2) Ordinary folk can't publish "dis information" challenging " verifiable Facts" posted by the first group.

So the ABC, BOM ,CSIRO or public servants say manmade global warming is real. Is it therefore a verifiable fact? If so then the rest of us can't dispute it.

Is manmade Global Warming a FACT or hypothesis?

bacci