Crematoriums in Sweden found a sustainable way to cut costs and be environmentally-friendly. After cremating a body, they will be reusing the exhaust produced to keep their building warm, instead of releasing it out into the air. They are also planning to expand and use the energy for homes as well, making them a crematorium power station. It's a controversial idea but certainly not a bad one (for me at least!).
Aside from human corpses, they have also turned on stray rabbits as energy source. These animals overpopulate some their parks and destroy plants and trees. Thousands are killed each year. So what they do is they bring these dead rabbits to a heating plant to be cremated. The heat is then redirected to the homes in Värmland, Sweden.
Aside from rabbits, other animal carcasses and wastes are used to produce energy. They call this fuel, Biomal. Here's a simple chart I got from treehugger that shows the process:
From Biomal.com: "..The raw material is just crushed and grinded and then pumped to a fluidised bed boiler where it is co-combusted together with a base fuel such as wood chips, peat or municipal waste. Energy is recovered from the animal by-products by producing renewable heat and electricity and the net outcome of energy is considerably increased."
Recently, Taiwan also adopted the cremation idea. Instead of heating though, Taipei Mortuary Services Office will be using it to power the air-conditioning system of their receiving area and possibly the lighting system of their building.
Sources:
http://www.independent.co.uk/life-style/house-and-home/cremated-bodies-to-power-aircon-in-taiwan-1801115.html
http://www.treehugger.com/files/2010/05/cow-carcasses-heat-swedish-homes.php
http://www.spiegel.de/international/zeitgeist/0,1518,654916,00.html
http://www.freerepublic.com/focus/news/2156917/posts
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