alternative
blade
blue
clean
cloud
cloudy
countryside
echo
ecology
electric
electricity
energy
environment
environmental
field
generate
generation
generator
global warming
green
green energy
industrial
industry
landscape
mast
metal
mill
nature
park
power
propeller
protected
renewable
rotate
rotating
rotation
sky
spin
spinning
stand
sustainability
sustainable
technology
turbine
watts
white
wind
wind turbine
windmill
wings