black
blue
bottle
box
carton
contamination
danger
dangerous
design
dirty
disaster
dropping
ecological
ecology
element
environment
environmental
flat
garbage
glass
green
icon
illustration
industry
isolated
label
litter
marine
multicolored
nature
nobody
object
ocean
old
polluted
polluting
pollution
problem
river
rubbish
sea
sign
symbol
tire
trash
waste
water