The one thing about climate change is that all data fits the hypothesis, thus climate change is a scientific law, same as gravity. Denying it is a waste of time, because, by design it can't be proven wrong. Anyways, I haven't seen anything coming from the scientific community that believes climate change is not manmade. You can argue the severity of the effects, however.

The 1.5 degree rise target they have set, requires a complete elimination of all green house gas emissions. If you go down the road of major climate policy activism, aircraft will absolutely be eliminated first, as people will sacrifice flying, long before they give up the basic necessities of life.