environmental
background
chemical
chemicals
color
danger
death
dirty
disaster
discharge
dump
ecology
ecosystem
emissions
energy
environment
factory
fatal
fish
garbage
gasoline
global
industrial
industry
influence
lake
life
mud
natural
nature
ocean
oil products
old
pipe
poison
polluted
pollution
pond
release
river
rusty
sewage
sewer
stream
substance
toxic
tube
urban
waste
water