animal
bird
bottle
can
container
contaminated
contamination
crime
destruction
dirty
duck
dump
ecology
environment
environmental
floating
food
garbage
global
grease
green
health
hygiene
industrial
kitchen
lake
landfill
mold
nature
park
plant
plastic
polluted
pollution
pond
problem
recycle
recycling
river
rubbish
sewage
storage
swim
toxic
trash
treatment
urban
waste
water
wild