to replenish (补充) the ones we’ve lost. One tree can take in 48 pounds (21.8kg) of carbon dioxide per year... goal, and you might wonder why trees are so important. Well for one, they can help stop climate ……

that it can help to clean sea water.”Agar-agar is an ingredient to make jelly that people can collect... pollution. “You cannot stop people going fishing, as it would cut their income, but we can think we may ……

, satellites help emergency workers (应急人员) deal with natural disasters. Farmers can use satellite... they die, they can go either of two ways. Satellites in lower orbit (轨道) are made to fall toward ……

and phone calls can be sent directly to a satellite and back down to different locations on Earth..., satellites help emergency workers (应急人员) deal with natural disasters. Farmers can use satellite images ……

;. When people say the word “invest”, you may normally think of money. But we can also... needs, and eats local produce (当地农产品).Do you have any ways to help your community invest in our planet ……

WE all know that environmental protection is very important. But the problem is: what can we do on a daily basis to help protect the Earth?Log on to www.biggreenhelp.com. It helps you learn more ……

WE all know that environmental protection is very important. But the problem is: what can we do on a daily basis to help protect the Earth?Log on to www.biggreenhelp.com. It helps you learn more ……

length of China’s Great Wall is about 21,200 kilometers. This means that we’d have to lay about 18... from Earth as we speak. In fact, scientists believe the moon is moving about 3.78 centimeters away from ……

and other resources (资源). Scientists want to find out if we can bring them to Earth in the future. More..., as we could use the moon to set up rocket launch pads (火箭发射台). So as you can see, the moon ……

. Although it’s just a story, it can become our reality if we don’t protect the Earth. The best way...电影《2012》带给我的思考。THESE days we are all talking about one topic – 2012. The film says that on Dec 21 ……

.Satellites can also provide information about clouds, oceans, land and ice. They help scientists predict... either of two ways. Satellites in lower orbit are made to fall toward Earth. They then burn up ……

in clouds, oceans, land and ice. 12:00: Do you eat rice for lunch? We can help farmers grow...:00: Do you eat rice for lunch? We can help farmers grow crops. We tell them when to water ……

to take care of it. So what can we do to help? Let’s find out!THE theme of Earth Day this year... have to take care of her.” Tips to protect our planetWhat can we do to protect our Earth? We can ……

farther and farther away from Earth as we speak. In fact, scientists believe the moon is moving about 3... is very different from Earth in most ways – it has no atmosphere, for instance, and its surface ……

for new sources of energy. One source is heat from the Earth. We know that the center of the Earth is very hot. We cannot reach the center of the Earth, but in some places the heat from the Earth’s center ……