abstract
background
black
chemical
cleanup
contamination
covered
crude
damage
danger
dirt
dirty
disaster
dump
ecology
environment
environmental
factory
fuel
garbage
gasoline
global
industrial
industry
leakage
liquid
mess
natural
nature
oil
petroleum
plant
polluted
pollution
poverty
rig
slick
spill
spots
stain
state
surface
tar
technology
texture
textured
toxic
trash
waste
water