It all helps doesn't it. It's not me versus a fella from a town in India, it's me doing that little bit that wouldn't ordinarily be done. Me using a paper straw, Me taking my washing.up liquid bottle to be refilled, me walking to the shops instead of driving. It's not going to save the planet by itself but it doesn't harm me to do all of that.
For clarity I drive a very old motorhome that spews fumes, I eat meat, I go on foreign holidays. I am not a saint.