animals
background
bad ecology
clean
contaminated
crisis
danger
dangerous
dead
death
die
died
dirty
dirty water
disease
drain
drainage
ecology
environment
environmental pollution
factory
fish
garbage
harmful
hazard
industrial
industry
infection
kill
lake
life
marine
natural
nature
ocean
poison
pollution
pond
problem
river
rotten
sea
sewage
sludge
smell
toxic
toxic water
treatment
waste
wastewater