I think this could be the heart of the problem, and it has been expressed on this thread already.
The idea that we just have to get this little local thing sorted, then we can think about the environment. The idea that we're all doing our best and what's the point of going to meetings if those nasty Chinese won't do anything anyway. I believe that there are many people who still don't understand the extent and urgency of the issue, and still don't appreciate that we need to fix it and we need to fix it now.
And that "we" is humanity, all of us, not just one national grouping, and that complaining about others not doing their bit is valid. But that staying home and not taking part in things isn't going to solve that issue.