📖 Unit 10: Energy sources - Reading lớp 7

We can use renewable and non-renewable energy sources to make electricity. Most of our electricity comes from power stations that use fossil fuels like coal, oil and gas. We call them non-renewable sources because they will eventually run out. Unfortunately, burning fossil fuels produces lots of greenhouse gases which cause global warming.

We also use renewable energy sources like the sun, wind and water to make electricity. We can use them again and again because they cannot run out. They do not produce greenhouse gases so they are much less harmful to the environment.

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Our environment is in trouble. People and industries are polluting the air, rivers, lakes and seas. There are many things you can do to help the environment. Here are a few.

Cars: The burning of petroleum is one of the biggest sources of carbon monoxide (CO) that causes global warming. CO thins the ozone layer, which protects us from the sunrays. So try walking, bicycling or using public transportation.

Energy: The biggest use of home energy is for heating and cooling homes. It costs a lot of money. So don’t use air-conditioners too often, especially at night. Replace regular light bulbs with low energy light bulbs, which use less energy.

Water: Showers use a lot of water. Buying a special “low-flow” shower head or taking shorter showers can cut this use in half.

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We use energy for almost everything we do: for heating our homes, cooking our meals and (1) ______. The use of energy is (2) ______ worldwide. It is responsible for many recent floods, droughts and storms.

What should we do to avoid these problems? Firstly, we should (3) ______ before going to bed or when going out. Secondly, we should use (4) ______ at home. Thirdly, we should (5) ______ to school. In conclusion, we should use energy more wisely for our future.