There are few unlimited resources on our planet, and the soon we all realize that, the better. Until we discover how to harness wind and solar power more effectively and cheaply, then we have to manage the energy resources we have with care.
Energy conservation is something we can all participate in by doing the little things that save a Watt here and a therm there. There are also things you can do in your home with your major applicances and central air systems that, over time, can help you save a lot of money while helping to preserve our natural resources. It's a true win-win situation!