Global warming is the increase of the earth’s average surface temperature due to the effect of greenhouse gases, for example, carbon dioxide, which trap heat that would otherwise escape from the earth. After the trees are cut down and more greenhouse gases are released, the “blanket” around the earth called the ozone layer (臭氧层), will get thicker. This catches more heat and makes the earth hotter. Luckily, there are many things that every citizen of the earth can do to help reduce the effects of global warming, and it’s never too late or too early for children to take action.

The children should learn what a carbon footprint is. A carbon footprint is the amount of carbon and greenhouse gases people make as they lead the daily life and go about the normal activities. In other words, the carbon footprint is a measure of the environmental impact (冲击) the life has. To live an environmentally friendly life that doesn’t contribute to global warming, people want to have the smallest carbon footprint possible.

Almost everything people do contributes to global warming and is related to fossil fuel consumption. These can be direct uses of fossil fuels, like riding in a gasoline-powered car, or indirect contributions to greenhouse gases, such as eating fruits or vegetables that have to be shipped from far way to reach their tables.

If a child wants to make a contribution to reducing global warming, he should ride a bicycle to the near park, school, his friend’s house, or anywhere else instead of taking the car. Or he may try to walk or jog, which is also helpful. In addition, although trains and buses often run on fossil fuels, on average, each person uses less energy and produces less pollution to run. Next time if children with their parents have to get around town or it’s too far to walk or bike, take the bus or other public transportation instead of asking for a ride.

【小题1】What is the first paragraph mainly about?

A．a brief description of carbon footprint.	B．The causes of global warming.
C．The protection of ozone layer.	D．The serious water pollution.

【小题2】Which of the following can describe the carbon footprint?

A．Useless.

B．Attractive.

C．Expensive.

D．Useful

【小题3】What can kids do if they want to help reduce global warming?

A．Go to the near park by bike.	B．Avoid taking the car or cycling.
C．Eating fruits from far away.	D．Go around the town with parents by car.

【小题4】What can be a suitable title for the text?

A．What Can People Do To Use Less Energy?

B．Why Global Warming Affects Humans’ Life?

C．How Can Kids Help Reduce Global Warming?

D．How Does Carbon Footprints Measure Pollution?