It gets a little philosophical. I'm assuming we're all familiar with deontology and consequentialism, but I've had to adopt a deontolgical position with my own actions in climate change. Individuals are contributing very, very little to the degradation of the planet's climate (local environment being another discussion, obviously - if you litter, you're still a piece of shit), but I still want to reduce my emissions because it's the right thing to do.
We're fucked if we don't get everyone on board with putting serious limits on industry, particularly the barges that ship goods across the Pacific...But yet, I'm still going to recycle and take shorter showers. I'd rather take a train than a plane. It almost certainly won't make a difference, but I'll still do it because I feel like I have to.