I really think scientists should speak up more about the situation. They'll be accused of "alarmism" by right wing media in any case. But they should be much more political and emphatic on necessity of swift action. Because what we've been doing so far isn't working. Emissions aren't being cut. We're still going almost full speed to a very bleak natural future.

In fact I think it's a duty of anyone with a basic scientific education to try and inform about the basic scary consequences (highlighted in this article) and propagate this information to their vicinity. Most people I talk to have no idea of the breadth of consequences. And then the second step is using democracy and voting specifically on candidates that are fighting to address the issue -- not only on national level but whatever level you can get (county,city,state).

Finally if massive change isn't detected in a few years (I'm skeptical) the higher organizations (UN, UNSC, etc.) need to start aggressively punishing emissions on a global level. Something like a mandatory carbon tax on every country seems like a good start.