The answer to all of the world's problems is sharing. I'm trying to teach my kids about sharing and I see parents all of the time trying to teach sharing to kids. It's not working. Sure, sometimes the Mugwump will share a toy with Sixpence when he's not interested in playing with it, but that's not going to save the world. Real sharing is going to save the world. By real sharing I mean making sacrifices of your personal wants and desires in order to serve the good of others or the community as a whole. Some of this sharing principle is forced upon us and we just need to recognize that we are sharing, no matter what and we need to be considerate of others.
I talked about water and air previously. Of course we will always have to have water and air, everyone will. That means that we are going to have to share. Is it really sharing when the people in Africa don't have clean drinking water and I use my clean drinking water to flush the toilet? Is it really sharing when industry pollutes a river to the point that I can no longer swim in it (not to mention drinking it)? Is it sharing to put bike paths on side streets with stop signs every block while cars get thoroughfares that never have to stop? Is it sharing when inversion is so bad in Utah County that I am not supposed to ride my bike because it is now a health hazard?
If the world is to truly prosper we are going to have to share. This may mean having one car per neighborhood. This may mean sharing rides, even if it makes it a little less convenient for yourself. We live in a very selfish, self absorbed society. If we get out and make some sacrifices and share with those around us we can make huge differences in the world. Did you know that the number one predictor of a low crime neighborhood is knowing your neighbor's name? What is your neighbor's name?
In addition to solving many environmental problems, sharing will bring communities together and increase social capital that is essential to a prosperous society.