1) People need it to breathe a) oxygen b) pollution c) water 2) Dirty water that pollutes rivers a) pollution b) sewage c) global warming 3) Animals that may soon die out a) recycle b) environment c) endangered species 4) Harmful gases produced by cars a) exhaust fumes b) pollution c) oxygen 5) A place where rubbish is thrown away a) sewage b) environment c) dumping site 6) To use some materials again a) recycle b) global warming c) dumping site 7) The natural world a) oxygen b) endangered species c) environment 8) Dirty air, water and soil a) oxygen b) pollution c) sewage

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