wind power
風力
background
carbon dioxide
change
climate
climate change
climate control
climate protection
co2
concept
direction
earth
ecology
ecosystem
efficiency
emission
energy
environment
environmental
environmental protection
german
global
global warming
green
greenhouse
greenhouse effect
international
kyoto protocol
nature
nature conservation
planet
plans
pollution
power
protect
protection
reduction
renewable
resources
road sign
sign
signpost
sky
strategy
sustainable
symbol
text
wind
wind turbine
word