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Dams and reservoirs are required ______ to store water during periods of surplus water availability.

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Fossil fuels like coal, oil and natural gas account for 81% ______ the total energy used in the USA.

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The use of biofuels helps to achieve energy ______ as it helps reduce the dependence on foreign oil for some countries.

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The average world’s temperature has risen ______ about 0.8 degrees Celsius over the past 100 years.

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Energy plays a key role for ______ development of a country.

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The ______ of around 40% of the world’s forests has serious impacts on over 1 billion people who live in and around forests.

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Building dams provides a great number of ______ benefits.

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Reducing the amount of carbon dioxide in the atmosphere mainly aims to ______ global climate change.