acid
air
atmosphere
blue
business
chimney
climate
co2
condensation
contamination
damage
dioxide
dirty
ecology
electricity
energy
environment
environmental
factory
fuel
fumes
gas
global
greenhouse
high
horizontal
impact
industrial
industry
nature
pipe
plant
poison
polluting
pollution
power
production
sky
smog
smoke
smoke stack
station
steam
technology
tower
toxic
vapor
warming
white