environmental
animal
background
bad
black
chemical
color
contaminate
contaminated
danger
dangerous
dark
dead
death
dirty
ecological
ecology
ecosystem
environment
fish
float
fumble
fumbling
garbage
harmful
industry
lake
nature
poison
pollute
polluted
pollution
pond
problem
river
rotten
salmon
sewage
smell
toxic
vietnam
vintage
waste
wastewater
water