Let me put it another way, do you think it is ok to send someone to jail for a crime you are 90% sure they are committed?
Yes. It's called 'beyond reasonable doubt' and it's the basis for virtually every legal judgment handed down.
The evidence for global warming and climate change is there and solid beyond reasonable doubt. I'm sorry you feel victimised by the fact that legislation has to be passed in order to ensure these problems can be effectively tackled, but that is unfortunately neither here nor there.