alternative

blue

clean

cloud

conservation

development

eco

ecology

efficiency

electric

electricity

energy

environment

environmental

farm

field

generate

generation

generator

global

green

industrial

industry

innovation

landscape

metal

mill

nature

plant

power

propeller

protected

renewable

resource

rotate

rotation

sky

supply

sustainability

sustainable

technology

tower

turbine

turbines

warming

watts

white

wind

windmill