environmental
bin
bottle
box
branches
clean
concept
container
contamination
cup
dirt
dirty
dump
earth
ecological
ecology
environment
forest
garbage
glass
grass
green
heap
industry
junk
landfill
litter
mess
natural
nature
nobody
old
outdoor
outdoors
park
people
picnic
pile
plastic
pollute
pollution
problem
protection
recycle
recycling
refuse
rubbish
trash
waste
woods