active
activist
bag
care
city
clean
clean up
cleaner
cleaning
day
dirt
dirty
earth
eco
ecology
ecosystem
environment
environmental
forest
garbage
girl
grass
hand
help
nature
ocean
outdoor
park
participation
person
plastic
plastic pollution
pollution
preservation
recycle
recycling
reuse
rubbish
sand
social
social work
solution
spring
trash
volunteer
volunteering
waste
wild
woman
worker