I mean... it is easy to be young and idealistic and want to tell everyone how to behave... without actually behaving well ourselves. So I'd propose for us to make it a point to recycle (even if it is inconvenient), pick up trashes we pass on the street (unless it is really soiled), conserve energy at home. And instead of getting agravated about what other people do with their lives, fix our own first. True, one person's out put is insignificant on the global scale, but if enough people do the same, then the accumulated effect would be worth while. And even if we don't see the result in our life time, at least we can say we did our part.