background
bottle
cellophane
city
clean
conservation
contamination
damage
dirt
dirty
disaster
dump
earth
ecology
environment
environmental
forest
garbage
grass
green
ground
heap
industry
junk
landfill
landscape
litter
littering
messy
nature
nobody
outdoor
park
pile
plastic
pollute
pollution
polyethylene
problem
recycle
refuse
rubbish
spring
toxic
trash
tree
urban
waste
wood
world