wind power
風力
bin
bulb
cell
concept
earth
eco
ecology
education
element
energy
environment
flat
flower
forest
fuel
icon
line
linear
medical
nature
outline
pack
park
pharmaceutical
plant
power
recycle
renewable
rubbish
set
sign
solar
solar panel
stroke
sustainable energy
symbol
technology
test tube
thin
think
think green
tree
waste
web
wood