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Science
Energy
Renewable
All Subcategories (16)
Biomass
Energy Sources
Greenhouse Gas Emissions
Nonrenewable
Ocean Wave Energy
Ocean waves
Solar
Solar power, wind power, hydro power
Wind
Wind Energy
Wind energy, Solar energy
Wind, Solar, Hydroelectric
Wind, Water, Biomass
Wood
Parent Categories (6)
Energy
Energy Resource
Energy Resources
Energy Source
Energy Sources
Materials