In recent years, the number of ____ problems has increased dangerously. One of the most serious problems is changes to the ____, which has led to the "____ effect"; this is making most climates warmer. It is already affecting several areas of the world with unusual ____, causing droughts or heavy storms. Cutting down on ____ fumes from vehicles would help solve the problem. Natural ____ such as oil and ____ are not endless, so using other forms of ____ such as wind, sun, water and even sea ____ would help preserve our planet. Very soon we will be able to drive cars in cities and towns that run on electricity - a much cleaner ____ than petrol. And we can also help to conserve finite resources by ____ things made of glass, aluminium, plastic and paper.

Save It! Gr&V FCE p.291

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