You have to hand it to the engineers working to keep the world green and our homes and workplaces efficient at a mad pace these days. There is no other way the harm that is being caused to the environment due to our lifestyles could be kept in check. Enter a Canadian company that offers heat exchangers that reuse the heat from the hot water that you use for your shower and more - Inhabitat has this entry featuring their Ecodrain which can save water heating costs by upto 40% at: http://www.inhabitat.com/2009/03/23/the-ecodrain-cuts-water-heater-use-by-40/
Now if only the homes that used this system were powered by wind or solar power . . .
My hat's off to Ecodrain and thanks are due to Inhabitat for bringing this information to the world. Ecodrain's website is: http://www.ecodrain.ca/