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They are working to preserve the delicately balanced                of these wetlands. 

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Fossil fuels which are non-renewable pollute the air and cause air ______.

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Recycling provides a method of reducing the amount of waste materials that gets to the landfills – thus ______ it less probable for environmental pollution to take place.

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If wastes are thrown ______, they can cause pollution in water, land and air.

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The area is roped off because the water is seriously polluted.         

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The effects of _____ are the environmental and social changes caused (directly or indirectly) by human emissions of greenhouse gases.

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We need to cut down on our fuel                by having fewer cars on the road.        

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Forest biodiversity is threatened by illegal                  carried out globally.