environmental
air
atmosphere
background
cesspit
cesspool
chemical
chimney
cleanliness
climate
cloud
contaminate
contamination
damage
dirty
ecological
ecology
emission
emit
energy
environment
factory
fumes
gas
global
greenhouseeffect
human
illustration
industrial
industry
landscape
ozone
pipe
poison
polluting
pollution
reflection
river
seascape
sky
smog
smoke
smokestack
steam
technology
toxic
warming
waste
water
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