atmosphere
atomic
blue
building
chemical
chimney
climate
cloud
coal
cooling
danger
ecology
electricity
emission
energy
environment
exhaust
factory
fuel
fume
generator
global
green
greenhouse
heat
industrial
industry
nuclear
oil
outdoors
pipe
plant
pollution
power
production
radiation
radioactive
red
sky
smog
smoke
station
steam
structure
technology
tower
toxic
turbine
vapor
warming
waste
white