"When it comes to the earth, there is no time to waste," says the Earth Day Network. And that is right. Protecting our environment is very important, and World Earth Day was created in 1970 to ask more people to protect our environment. On April 22, people around the world celebrate Earth Day.

    Every year there's a special topic, and in 2016 it is "Trees for the Earth”, so Earth Day that year was all about planting trees. They planned to plant 7. 8 billion trees.

    That's a big goal, and you might wonder why trees are so important. Because they can take in carbon dioxide (CO2) and improve the air quality. CO2 is a chemical in our atmosphere, but humans make too much of it, which is bad for the environment.

    Well guess what! Planting new trees is important because people cut down a huge number of trees. Once there were about 3 tillion 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 18. 3 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.

Even the simplest everyday activities can the environment.

We are four groups to do the experiment.

It's without doing.

    We all waste food, you and me, every day, millions of tons of it. In China, enough food is wasted in restaurants every year to feed 200 million people. And the amount of food wasted by Chinese consumers is increasing fast. So our nation is being encouraged to stop wasting food.

    So what should Chinese consumers do to prevent food waste?

    ◆Keep a kitchen diary

    All of us should keep a kitchen diary, and we can know how much food we waste at home. The first thing for us to do is stop throwing away food that we can. still eat. We should eat everything we buy and if we cannot, we should buy less.

    ◆Buy only what we need

    We should ask for smaller portions in stores. We should also check how much food we have before buying more. We shouldn't bring much food we don't need home even if large posters ask us to do so.

    ◆Develop the habit of packing food

    Chinese consumers are generous and friendly. In restaurants, often too much food is ordered and served. So when ordering out, we are supposed to exclude the food in the order if we don't plan to eat it. And order smaller servings in restaurants and take home what we cannot finish.

    Don't put it off! Let's stop food waste today!

    Today the forests in the US almost . A lot of good land has gone with them, leaving only sand. China doesn't want the US's example. We are planting more and more trees. We've built the Great Green Wall of trees across the northern part of our country. The Great Green Wall about 7,000 kilometres long, and between 400 and 1,700 kilometres wide. It will stop the wind from the earth away. It will stop the sand from moving towards the rich farmland in the south. More Great Green Walls are needed. Trees must be grown all over the world. And I think if we do like this, the Great Green Walls of trees the world better.