composting
biodegrade
bioecology
buried
bury
cleaning
compost
contaminated
contamination
design
discard
disposal
dump
ecology
environment
fill
flat
garbage
green
ground
harmful
illustration
junk
land
landfill
litter
organic
out of town
pit
plastic
pollute
polluted
pollution
problem
recycle
recycling
rubbish
shovel
soil
solid
threat
throw
throw away
toss out
town
toxic
trash
urban
waste