There is too much carbon dioxide in the air. When oil, gas and coal are burnt, they create a large amount of carbon dioxide. We send around five million tons of carbon dioxide into the atmosphere every year. This amount will double in fifty years. This carbon dioxide lets sunlight enter the Earth’s atmosphere and heat the Earth. However, it doesn’t let much heat leave the atmosphere and enter space. It is like a blanket. That is, the heat can pass from the sun through blanket to warm the Earth, but the heat stays there and cannot escape through the blanket again. Scientist call this the greenhouse effect.
- When we burn oil, gas or coal, they give out carbon dioxide. _______________
- Every year about five million tons of carbon dioxide is sent into the atmosphere. _______________
- This carbon dioxide heats the Earth directly. _______________
- The “greenhouse” is named after scientists. _______________
Read the passage again and choose the best answer.
- What is the passage mainly about?
A. the greenhouse effect B. five million tons of carbon dioxide
C. a blanket in the atmosphere D. oil, gas, and coal which are burnt on the Earth
- Which of the following can be inferred from the passage?
A. Scientists are also conservationists B. The Earth is heated by carbon dioxide
C. The word blanket is a layer of carbon dioxide D. Carbon dioxide doubles every day.
