World
We're encouraged as kids to go out and conquer the world. "The world is your oyster!" (I don't really get what an oyster has to do with anything, but you get the point.)
When did we become more important than the world we live in? When did what we want and how we want to live become a larger concern than the earth we so desperately need to survive?
No one wants to leave this earth without leaving something behind, a footprint. But the footprints we've been making for the last 100 years are cementing the future of our children.
We demand choices, but are removing the option of choice for those to come.
Footprints aren't only measured in carbon credits. Your footprint can be seen in trash left on a trail, an ended relationship because you were just too busy, a smashed front bumper because you decided to grab the keys that night; you leave a footprint everywhere you go.
Everything you do, whether good or bad, leaves something behind and has an effect on what is to come.