But what I really get excited about is water. I think about water a lot and what's going to happen when there isn't enough to go around. If you think oil wars are bad, just wait til we start fighting over water, which is why conservation now it extremely important. Some day I would love to install a gray water system that captures all of our sink, shower, and laundry water to reuse in the garden or at least the toilets. It's such a waste-all that nearly perfect water washing down the drain to be mixed with our nasty toilet water. I think about it every time I brush my teeth. There's a group called Greywater Guerrillas out of the Bay Area (I think) that has a website all about sustainable household water issues. It's pretty cool. Installing a system is pretty pricey I think and California's permitting process makes it difficult but I still dream about doing it some day.
Another thing I really want to do, which I think is much more feasible is rain water harvesting. I want to attach water storage tanks to our downspouts and keep the rainwater collected in the rainy season to use as irrigation in the summer. So much of our water runs off of roofs and paving and then into sewer drains and out to the bay. All this water can be collected and used instead of using perfectly clean drinking water to water our rose bushes. Honestly it's a bit ridiculous when you really think about it.