I am a recently married thirty year old living in Oregon. My wife and I don't want to have any kids and we don't subscribe to religion or any ideology. Because of this why should I be concerned about global warming which won't affect me in any major way in my lifetime? I do not have any responsibility to future generations because all my friends and family are either older or around my same age as well.

Your view, dear reader, seems to presuppose that the only reason anyone should care about global warming (or any other problem that will affect future generations) is that one may have (biological?) descendents that might be affected. That presupposition seems false. On the one hand, it's not obvious why I should care more about my distant descendents (e.g., great-great-great-great grandchildren) more than other people who live 100+ years from now. If we care about any other people (i.e., are not egoists in the strictest sense of the term), then it seems we have good reasons to care about (and we have obligations to) lots of living people we don't know at least as much as distant descendents we don't know. If biological relatedness is supposed to support your presupposition, it would suggest that we should care less about our adopted children than biological ones, which seems false. And my relatedness to distant descendents gets cut in half each generation, so after enough generations, I'll be...