While I and you can have an opinion, as we are dealing with a very complicated scientific fact, our opinion has as much weight as our opinion on whether dark matter exists or whether the Riemann hypothesis is true - i.e. none at all.
This is a topic which huge political implications (unlike the validity of the Riemann hypothesis), so that scientists working on it have no doubt a large amount of pressure, but I will still defer to the smart and prepared people that devote their life to researching this topic. The current consensus among the vast majority of this community is "Yes and it's definitely the result of human activity.".
If you want the truth, this is the best approximation we currently have (like all of science, it can be perfected and even corrected as our understanding and evidence improves). If you want to continue destroying the planet without hurting your conscience, feel free to hold any of the other opinions
PS. I am well aware that there are divergences within the scientific community. But the overwhelming consensus is that there is warming that is at least partly caused by human activity. There is no question also that "more research is needed" to get a better picture.