In the backdrop of recent drastic weather patterns worldwide, it is vital to realize that most people (including presidents and heads of states) agree that global warming is happening. The point in contention, however, is whether humans are causing it. I don't think they are.
My view is, humans are insignificant in the bigger scheme of things (volcanoes, earthquakes, land/oceanic gas releases, forest fires, solar flares, cosmic radiations, meteor strikes, etc).
As such, claiming humans cause global warming is like claiming the sea becomes saltier when humans pee in it.