environmental
abominate
bacterium
biomass
bottle
clean
container
contamination
decline
dirt
dirty
disdain
ecology
engineering
environment
excremental
excretion
factory
filth
filthy
foul
garbage
global
industry
nasty
nature
outdoor
pet
plant
plastic
pollute
polluted
pollution
processing
protection
purity
recycle
recycling
reduce
reflection
refuse
repulsive
river
rubbish
trash
unhygienic
warming
waste
waste water
wastewater