environmental
abandoned
bag
calamity
catastrophy
concept
conservation
contaminate
contamination
damage
danger
debris
decay
demolition
difficulty
dirty
disaster
disposal
dump
eco
ecology
environment
fall
forest
garbage
grass
harmful
illegal
industrial
junk
junkyard
landfill
landscape
litter
littering
nature
pollution
problem
protection
recycling
rubbish
scrap
threaten
tip
toxic
trash
tree
trouble
unauthorized
waste