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Types of energy

The majority of products with a power supply use batteries or mains energy which draws on energy produced from fossil fuels.  If you need to take this type of approach then remember -

BEST = Mains power 
OK = Rechargeable Nickel Metal Hydride(NiMH), or Lithium Ion or Alkaline (Rayovac / RAM)
AVOID = Disposable alkaline (like Duracell) or lithium batteries and rechargeable Nickel Cadmium (NiCad)

(Source: http://www.biothinking.com/materials.htm, 2004)

More information

Information on the environmental impact of batteries visit - http://www.earth911.org/master.asp?s=lib&a=electronics/bat_env.asp