environmental
boom
bottle
chemical
circle
clean
container
containment
contamination
danger
dirty
dump
ecology
environment
excretion
floating
garbage
green
industry
lake
messy
natural
nature
oil
outdoors
pile
plant
plastic
poisonous
pollute
polluted
pollution
recycle
recycling
refuse
reservoir
risk
river
rubbish
sea
sewage
smell
substance
toxic
trash
ugliness
unhygienic
warming
waste
water