-Watch out for global warming.
In recent years, people feel that the weather has suddenly become hot. The original cool autumn almost didn't start until the end of 10, and the hottest day in August actually reached more than 40 degrees. Why is this? It turned out to be human's own fault.
With the rapid development of human high technology, the side effects of science are gradually reflected, and global warming is an example. The weather is hot, and soaking in air conditioning in the heat has become a new "hobby", but have people ever thought about the negative effects of air conditioning? Of course, the answer is yes. The gas discharged from air conditioners contains a lot of methane, which is also a gas that causes global warming. At the same time, air conditioning will waste a lot of electricity, so try to avoid using air conditioning.
And another reason is: carbon dioxide! Automobile exhaust and factory exhaust contain a lot of carbon dioxide, which is the most likely to cause greenhouse effect (that is, global warming). There are more and more cars now. According to statistics, by 2 1 century, there will be 700 million cars in the world, and a large amount of exhaust gas will seriously affect us, such as cough and pharyngitis ... The most important thing is global warming. Statistics show that the per capita carbon dioxide emissions in the United States have reached 20 tons a year! China's annual per capita carbon dioxide emissions are also 2.5 1 ton a year! The environment around us is undergoing serious changes.
The more important reasons are: sharp decline of forests, destruction of water resources, serious destruction of ecological chain, barren land and serious water pollution. According to statistics, 65,438+00% of the rivers in the world are polluted, and the supply of fresh water has become a problem. At the same time, due to the extensive use of minerals, the burning CO2 gas caused air pollution, and the ozone layer was severely damaged, and ozone holes appeared in the north and south poles, which aggravated the environmental deterioration. This vicious circle will eventually lead to a serious impact on people's lives.
What kind of tragedy is this? Of course it is obvious! The weather is getting hotter, the sea level is rising, the glaciers in the North and South poles are melting, and coastal cities and island countries are flooded. All these have seriously affected the survival of mankind. Experiments show that the sea level will rise by more than half a meter in the next 300 years, which is still the most optimistic data. In another seven years, global warming will continue irreversibly. What is even more frightening is that due to the melting of the Arctic ice, rainfall has increased, and a large amount of fresh water has flowed into the North Atlantic, destroying the Mexican warm current. Once the Mexican warm current is cut off, the temperature in northwest Europe will drop by as much as 5-8 degrees, which will probably lead to a new ice age! I'm sure you've seen the film The Day After Tomorrow. The scene in the play is a true portrayal of our planet hundreds of years later: tornado, ice crack, sudden drop of temperature, ice storm, freezing rain, earthquake, flood, tsunami ... This is not a crazy fantasy, but it will become a reality if human beings don't stop destroying the environment! Global warming is not only hot weather, but also many negative effects!
In order to save the earth, we should try our best to do it: don't turn on the air conditioner, use recycled environmental protection paper, discard meat (steak) food (the digestion of cattle contains nitrous oxide, if you become a vegetarian, reduce carbon dioxide emissions 1.5 tons every year! ) instead of plastic bags, take the bus ... bits and pieces of life. In fact, environmental protection is not difficult. As long as you support environmental protection, that is your best gift to the planet. You don't need too many words. As long as everyone acts, it will be a powerful force! Today, Japan, Britain, the United States and other countries have taken action. Although we have taken action, it is still not enough for a big country with a population of 654.38+0.3 billion.
Therefore, being alert to global warming is the only way for all mankind to save the earth. Some people may say: can't we move to other planets? The answer is yes, but how many people can it accommodate? Some people say that the funds for controlling the greenhouse effect are too large, which is sky-high for finance. However, if we keep dragging on, the final result will be that our planet is beyond recognition, not to mention finance, and even our own lives will be in danger! Therefore, environmental protection should not just stay in words, but should really be implemented in action.
ㄗs heartless o о 20: 38: 47
The relationship between human or animal survival and plants
Not long ago, our family moved into a new house. Just moved home, my uncle and aunt sent some pots of flowers and trees. Bonsai is placed at the door, living room, room and balcony. I said to my father, "We have a botanical garden at home. Why do we have so many plants? " Dad smiled and said, "Plants can create an atmosphere and purify the air. People and animals cannot do without them. " People or animals cannot live without plants? Why can't people or animals live without plants? I'll be skeptical. Decided to do a few small experiments to prove the problem.
On Sunday, I caught two mice from the garage. These two poor little mice will be my experiments. They have been struggling, and the round disposable film tablecloth stared at me with small eyes. I put the first mouse in a big fish tank and sealed the glass bottle tightly, for fear that the air in the bottle would communicate with the outside air. I watched carefully and saw the little mouse running quickly around the bottom of the cylinder against the wall. Hey, isn't the mouse alive and well? Isn't it true what dad said? However, in a few minutes, I saw the little mouse winding slower and slower until it was stagnant and dying. Suddenly, I gently removed the disposable film tablecloth, grabbed the first mouse, put the second mouse in, and moved into four pots of leafy plants. Then gently cover the disposable film tablecloth. I kept patting the fish tank and saw the little mouse scurrying about in panic. After a long time, I don't want to die. This experiment proves that plants can transport the oxygen that animals need.
In order to further prove the dependence of humans and animals on plants. I came to a feed processing factory near our hometown. The air there is full of dust noise, which makes me cough. I feel very uncomfortable. Then, I ran to a bamboo forest behind our house. It is a place with fresh air, and I feel extremely refreshing. This experiment proves that plants can purify the air. Let people breathe smoothly.
These two experiments prove that the survival of human beings and animals is closely related to plants. How scientific is this? Our scientific and technological team came to the library to consult a lot of scientific and technological books, and also went to the electronic north reading room of the school for online inquiry, and summarized the following points: ① People must rely on plants to provide oxygen, and only plants can make oxygen. If a person doesn't eat or drink for a few days, he may die in a few minutes. Oxygen is the first need of human life activities! An adult breathes about 20,000 times a day, inhaling 0.75 kg of oxygen and exhaling 0.9 kg of carbon dioxide. (2) Breathing of animals and plants and burning of substances also consume oxygen and release carbon dioxide. So, isn't there more oxygen in the air every day? Don't! The reason why there has never been such a crisis between heaven and earth is that plants are both "factories" of natural oxygen and "broad markets" of carbon dioxide. According to statistics, 1 hectare of broad-leaved forest can produce 750 kilograms of oxygen and eat 1 1,000 kilograms of carbon dioxide every day during the growing season. Therefore, as long as there are 6,543,800 square meters of trees, it can supply a person with oxygen demand and absorb exhaled carbon dioxide. Because there are plants that constantly supplement oxygen, the oxygen in the air can be kept basically constant. On the contrary, if there are no plants, the oxygen on the earth can be used up in about 500 years.
Therefore, human beings and animals can sustain life, and the oxygen needed for activities must be attributed to green plants. Plants are closely related to our human and animal lives. Let's protect plants from now on!