acid
air
brick
business
chemical
chimney
contamination
corporation
destruction
ecology
energy
environment
exhausting
factory
field
fuel
fume
gas
generate
global
global warming
industry
landscape
law
manufacturing
meadow
mill
nature
oil
old
ozone
poison
polluting
pollution
power
rain
rice
sky
smog
smoke
smokestack
steam
structure
technology
toxic
vapor
warming
waste