I don't suppose anyone can be sure. These are early days and the only way we can know that things are changing is if the bad stuff keeps piling up year after year.
But according to one article I read recently, most of the relevant scientists take the line that global warming is happening and it's too late to do anything about it.
Cutting down carbon emissions- all that righteous stuff- won't change a thing.
Instead we have to start adapting- to climate change, new weather patterns, altered coastlines.