acid
air
cancer
chemistry
chimney
cloud
contamination
critical
culls
danger
dangerous
dead
dirtiness
disaster
dump
ecology
energy
environment
factory
foulness
garbage
illegal
illicit
industrial
industry
landscape
litter
masrian
nature
orange
plant
polluted
pollution
problem
refuse
rubbish
smog
smoke
smokestack
soil
tailing
trash
unhealthy
unlawful
unnatural
warming
wastage
waste
wasteland
yellow