Sure there's a solid chunk of the population who doesn't give a shit and doesn't believe there's a problem to begin with.
But a lot of people do give a shit but are realistically powerless to effect change. Turning all your lights off and walking to work isn't going to change shit. It's big business that is mainly at fault here. They've just spent years brainwashing everyone to think that if we don't leave the water running while brushing our teeth it's magically gonna solve all our problems.
So what are people who can't make an actual dent in the problem to do with a weekly "ANOTHER TIPPING POINT HAS BEEN REACHED" sort of article? It's basically noise now.
But a lot of people do give a shit but are realistically powerless to effect change.
They could've started by voting for parties and candidates that want to actually do something. But the matter of the fact is that all climate actions cost money and will affect us, and that's not what voters want. And yes, swapping your car for alternatives and eating less or no meat & diary products is actually having a big impact. Same with where and what you buy as those large companies that everyone cries about are in the end still producing their shit for you and me.