carbon dioxide( CO2)and protect the air quality (E). CO2 is a chemical in our atmosphere, but humans make too much of it. Each person makes about 2.3 tons a year, which is bad for the environment Well guess what! Planting new trees is important because people cut down a huge number of trees. Last year, there were 3 trillion trees in the world, about 139 billion in China. But according to China daily, the worlds total number has been almost cut in half since human civilization( Hi)began. Thats because 15 billion trees are cut down every year So we need to plant more to make up for (5ix)the ones we lost. One tree can take in 21.8 kilograms of CO per year. And it's still one of the cheapest and best ways to get rid of coz But dont forget that we can also help the environment by cutting down on how much energy(EiR)or water we use every day. Every little thing helps 根据短文内容,回答问题(1-4),英译汉(5) 1. When do people around the world celebrate World Earth Day? 2. What is the topic of Earth Day this year? 3. Why are trees so important to the earth? 4. How much CO can two trees take in 5. Put the sentence "And it's still one cheapest and best ways to get rid of COz. int Chine6 carbon dioxide (CO2) and protect the air quality (质量). CO2 is a chemical in our atmosphere, but humans make too much of it. Each person makes about 2.3 tons a year, which is bad for the environment. Well guess what! Planting new trees is important because people cut down a huge number of trees. Last year, there were 3 trillion trees in the world, about 139 billion in China. But according to China Daily, the world’s total number has been almost cut in half since human civilization (文 明) began. That’s because 15 billion trees are cut down every year. So we need to plant more to make up for（弥补）the ones we lost. One tree can take in 21.8 kilograms of CO2 per year. And it’s still one of the cheapest and best ways to get rid of CO2. But don’t forget that we can also help the environment by cutting down on how much energy(能源) or water we use every day. Every little thing helps. 根据短文内容，回答问题（1—4），英译汉（5）。 1. When do people around the world celebrate World Earth Day? ________________________________________ 2. What is the topic of Earth Day this year? ________________________________________ 3. Why are trees so important to the earth? ________________________________________ 4. How much CO2 can two trees take in each year? ________________________________________ 5. Put the sentence “And it’s still one of the cheapest and best ways to get rid of CO2.” into Chinese. _________________________________________________________________________