m22.    How are energy resources used?

Hydropower and biomass supply 17% of the world's energy and 9% of the US's energy. Of the energy reserves 92%are potentially renewable. Non-renewable resources make up the rest:  5% is coal, 2.5% is oil and 0.5% is uranium. Each $1 spent on renewable energy generates $2.33 to $2.92 of local economy activity versus $0.64 generated by imported oil.

e10.    Why do organisms become extinct?

e13.    What is biomass?

e17.    How do organisms use matter?

g06.    What are some of our energy resources?

g17.    Is some matter more useful than other matter?

g27.    How fast are supplies of mineral being used up?