• hydro-electric power: thủy điện

• fossil fuel: nhiên liệu hóa thạch

• organic material: chất hữu cơ

• geothermal source: nguồn địa nhiệt

• run out: cạn kiệt

• chemical: hóa học

• convert: chuyển đổi

• generator: máy phát điện

• turbine: tuabin

Coal, oil and natural gas are fossil fuels. Organic materials formed them over millions of years. Fossil fuels are non-renewable. We cannot replace them. When we burn fossil fuels, the chemical energy inside them becomes heat and light, but burning fossil fuels produces pollution.

Renewable energy resources include wind, waves, sunlight and geothermal sources.

These resources will not run out and do not produce pollution. Solar energy comes from sunlight. Nowadays we use solar cells to convert sunlight into electricity and solar panels to heat up water. We also use moving water such as waves to turn underwater generators, and turbines to generate electricity from the wind. We should produce more of our electricity by using renewable energy resources so that fossil fuels won't end. We can also save energy. We can walk to school, wear warmer clothes and turn off lights and appliances when we don't need them.