1. Greywater

... documented cases of greywater-transmitted illness in the U.S. They say this suggests that the reuse of greywater could represent a safe way to conserve natural water supplies and keep natural freshwater ...

2. Sustainable Energy

... in our lifetimes. Efficient energy use is essential to slowing the energy demand growth so that rising clean energy supplies can make deep cuts in fossil fuel use. If energy use grows too rapidly, renewable ...

3. Energy Conservation Overview

... that puts energy efficiency first, renewable electricity supplies second, and new fossil-fired power plants last. Still, efficiency often has taken a secondary position to new power generation as a solution ...