alternative
blade
blue
conservation
corn
development
efficiency
electric
electricity
energy
environment
environmental
farm
field
generate
generation
generator
germany
global
grass
green
industrial
industry
innovation
landscape
mill
nature
plant
power
production
renewable
resource
rotate
rotation
sky
spin
supply
sustainability
sustainable
technology
tower
turbine
white
willich
wind
windfarm
windmill
windpower