alternative
bio
canister
concept
conservation
design
development
drop
earth
eco
ecology
element
emblem
energy
environment
environmental
environmentally
factory
friendly
garbage
global
globe
green
growth
home
house
icon
illustration
label
leaves
logo
mark
minimal
modern
nature
organic
plug
power
protection
recycle
renewable
safe
save
seedling
sign
silhouette
simple
sphere
start
style
sustainable
symbol
tree
water
web
window
world