authorities
carrier
conservation
consumption
control
current
demand
ecology
efficency
efficent
efficently
electric
electrical
electricity
energy
environment
environmentalitism
extraction
farm
future
gases
generation
global
green
greenhouse
mix
park
pollution
power
production
protection
provider
recovery
regenerative
renewable
replenishable
require
requirement
resource
resources
source
sources
station
supply
transition
use
utility
warming
wind