Let's Brainstorm the types of energy that are available.
What is the source of each type of energy?
Is the source renewable (we can grow, or gather more) or non-renewable (once it is all gathered, we cannot make more)?
There may be a few sources of energy that you didn't know about:
http://www.re-energy.ca/pdf/renewable-energy-basics-bg.pdf
http://www.altenergy.org/renewables/renewables.html
http://www.epatric.com/classes/sbc/alt-energy/
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