environmental
background
barrel
blue
chemical
chemistry
color
container
corrosive
crude
danger
dirty
disaster
discarded
drum
dump
ecology
empty
energy
environment
factory
fuel
garbage
gas
gasoline
hazard
hazardous
industrial
industry
iron
metal
metallic
oil
old
outdoors
petroleum
poison
pollution
recycled
recycling
rubbish
rust
rusty
safety
steel
storage
tank
toxic
warehouse
waste