air
atmosphere
belching
big
building
business
carbon
chemical
chimney
climate
co2
coal
dioxide
ecology
electrical
electricity
emission
energy
enviromental damage
environment
exhaust
factory
fossil fuel
fume
global warming
heat
high
industrial
industry
manufacturing
night
plant
pollution
power
power plant
red
sky
smog
smoke
smoke stack
smokestack
steam
steel
stripes
tall
tower
toxic substance
vapor
waste