agua

body

canal

change

chemical

climate

contamination

danger

destroying

dirt

dirty

disaster

discharged

drain

drainage

drinking

dump

ecological

ecology

environment

environmental

factory

fast

flow

flowing

focus

garbage

illegal

industrial

industry

influence

life

mankind

natural

nature

pollute

polluted

polluting

pollution

problem

resource

river

rivers

sample

selective

sewage

stream

technology

toxic

unhygienic

urban

water