Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

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

Find the mistake.

Over the last 140 years, the Earth’s average temperature has risen to almost 1 degree Celsius.