I'm kindof appalled at how many Shizzies stick to the "one person doesn't make a difference" attitude. No, your one cup won't be THE cup that prevents my niece's children from having breathable air. But culture is a cumulative thing, and if you want it to change, you should participate.
My point wasn't that "one person doesn't make a difference" or that "individual actions don't matter" in general. Nobody is advocating for apathy.
I said individualist consumer politics aren't going to be effective in fighting climate change. By focusing the discussion on consumer habits, you're shifting the blame from the people who are actually responsible for mass ecological destruction. Climate change is a direct result of an economic system predicated on infinite growth on a planet with finite resources. Even millions of people recycling their plastic water bottles or not using styrofoam won't save the planet as long as the relations of production remain as they are. Literally nothing other than a complete restructuring of the global economy can reduce the coming climate catastrophe, and that can only come through well-organized mass action because nobody in power is going to give enough of a shit to change things.
And I'm not saying "we're fucked so you might as well do nothing." There are a lot of things people can do to begin moving towards a more ecologically sustainable society. You can take to the streets with groups like Extinction Rebellion. You can get involved in mutual aid work with groups like Food Not Bombs to reclaim and redistribute food waste and empower your local community. You can work to build economic dual power structures like Cooperation Jackson to make your communities less dependent on the greater exploitative and wasteful system. Or you can unionize your workplace to take even just a little bit of power out of the hands of the people who exploit your labor.
My point is that you have to actually organize, or materially support those who are organizing, if you want to make any sort of ecological impact. Recycle as much as you can, sure. But if your actions are limited to making more "sustainable" consumer choices, you're mostly just making yourself feel better.