abstract
background
bright
care
change
climate
concept
conservation
consumer
consumption
cost
eco
ecological
ecology
economical
economy
efficiency
efficient
electric
electrical
electricity
energy
environment
environmental
equipment
fluorescent
friendly
future
glass
green
high
house
household
idea
illustration
isolated
lamp
lampara
less
light
lightbulb
low
modern
object
objetos
power
save
symbol
technology
watt
white