bag
car
collecting
danger
dangerous
dirt
dirty
disaster
disposal
dump
ecologist
ecology
environment
environmental
garbage
health
industrial
industry
junk
litter
man
mask
messy
nature
occupation
outdoor
people
person
pile
plastic
pollute
polluted
pollution
problem
profession
protective
recycle
recycling
research
rubbish
safety
sample
specialist
together
toxic
trash
truck
volunteer
waste
woman
work
worker