I suspect that collectively, we actually DO want to; we've just ended up with social and political systems, both domestic and international, that conspire against actually managing to do anything serious about it, like some prisoners' dilemma played out on a grand stage.
For example, we collectively would like to live a nice life on planet Earth. If climate change is real (and I'm in the majority that believes it is the case), then that that nice life is at great risk. But we do not collectively believe that climate change is real because of the aforementioned conspiracies to try to make us collectively disagree.
I suspect that collectively, we actually DO want to; we've just ended up with social and political systems, both domestic and international, that conspire against actually managing to do anything serious about it, like some prisoners' dilemma played out on a grand stage.