bay
black
bottle
can
care
clean
colore
day
different
dirty
diverse
dump
earth
ecology
environment
forest
garbage
glass
grass
green
heap
household
lake
metal
nature
package
paper
park
planet
plastic
pollution
pond
rag
recycle
recycling
reservoir
rubbish
save
shore
spring
tin
trash
tree
trunk
volunteer
waste
water
work
world
yellow