environmental
alternative
bright
bulb
concept
conceptual
conservation
consumption
creative
development
earth
eco
ecological
ecology
efficiency
electric
electricity
energy
environment
friendly
future
global
glowing
grass
green
idea
imagination
industry
innovation
invention
lamp
light
lightbulb
natural
nature
planet
plant
power
process
production
renewable
resource
responsibility
reusable
reuse
solution
sustainability
sustainable
symbol
technology