alternative
auto
automobile
car
clean
climate
concept
conservation
cord
dependence
design
eco
ecological
ecology
economy
electric
electrical
electricity
electro
energy
environment
environmental
fuel
global
graphic
hybrid
icon
industry
line
linear
nature
plug
power
pull
recycle
renewable
sign
simple
simplicity
strain
stretch
symbol
technology
thin
tighten
transport
vehicle
wire