I like this and care deeply about what happens to our world after I am gone, but I worry (excessively, actually) that most others do not. Greed, immediate gratification, etc, these things cloud our judgement so greatly that even I have trouble remembering that the future exists with or without me in it.
It's an interesting problem to think about, but I have no idea what branch of philosophy it falls under, so pardon my sophistry. I do wonder, though; how do we get people to care about this?