Why is it so hot?

[Why is it getting hotter and hotter? Constitute]

During the Spring Festival, the weather is clear and sunny, and the temperature rises slowly, which adds a lot of fun to the festival. Why is it getting hotter? Composition. I have been visiting relatives with my parents these days, going to the park and sometimes playing with children. I'm sweating all over almost every day. I thought, "Isn't it winter now? Why is it so hot? " I ran to ask grandma. Grandma smiled and said, "Yes! It's winter now, unlike winter. Many pedestrians in the street have taken off their winter clothes, and even my old woman only wears sweaters! Scientists say that in the past 100 years, the global temperature has risen by nearly one degree on average, and now the earth is getting warmer this year. This warm winter phenomenon is a manifestation of global warming. " "Grandma, why is the world getting warmer?" I asked quickly. Grandma said: "Now the industry is developed and the transportation is developed. Look at the chimneys in factories, the speeding cars in the streets, and the trains, ships and planes traveling from south to north. They consume tens of thousands of tons of coal and waste oil every day and emit a lot of waste gas into the air. Originally, carbon dioxide and other waste gases can be absorbed by plants. However, due to human deforestation, carbon dioxide in the air has not decreased, but has increased sharply. These exhaust gases surround the earth, as if the earth is wrapped in a thick invisible film, so that the hot air on the ground cannot be dispersed, so people will feel hot. " Having said that, grandma also gave me an example of a farmer's uncle growing vegetables in a plastic greenhouse in winter. Say that our earth is like a greenhouse that is not easy to dissipate heat. The more I listen to it, the more interesting it becomes, and the more questions I have in my mind. So I asked my grandmother, "Is global warming a good thing or a bad thing?" Grandma was afraid that she couldn't explain clearly, so she found a science magazine from the bookcase. After watching it for a few minutes, she told me: "Scientists have analyzed that global warming does more harm than good. If the temperature continues to rise, the ice and snow in the Antarctic and Arctic will melt faster and the sea level will rise. If we don't try to control it, coastal cities like Shanghai and new york may be submerged by seawater in 50 years. At the same time, proper global warming will accelerate the evaporation of water. Composition. " I was so scared that I stuck out my tongue and thought, "What a terrible thing! All this is caused by waste gas. If one day, people use solar energy and electric energy instead of coal and waste oil and plant trees everywhere to purify the air, then the bad thing of exhaust gas will be useless, global warming will stop and our living space will become more and more comfortable and beautiful! "Why is it getting hotter and hotter? Primary school students' composition of 750 words (/)