Then the people who aren't willing to do anything about it should just shut up already. It's like complaining that the person in the stall next to you is making the bathroom smell like shit, while you sit there taking a dump.
Think about the difference between how we individually spend time and effort to sort our recyclables, and how meaningless (and even harmful) that turned out to be, when the real problem was that governments weren't cracking down the unnecessary production of plastics.
"OH COME ON, if you were serious you'd have spaced yourself by now so you stop generating CO2. Just shut up already."
[EDIT] OK so that's hyperbole but I do think it's absurd to disregard someone's opinion on climate change because they haven't voluntarily and unilaterally upended their own life in order to delay warming by, maybe, a few seconds.