People and Society Give me back the blue sky. Ancient poets wrote about the sky, "the river and the sky are the same color without any dust"; modern writers wrote about the sky, "the blue sky is spotless, crystal clear and transparent". It's a pity that we rarely see such beautiful "sky" nowadays. Especially in cities or industrial areas, the air is smoky and hazy all day long, which is really unpleasant. Faced with all this, you may not be able to help but sigh: "Fresh, refreshing, and clear atmosphere, where have you been? Cure the "disease" of the atmosphere quickly and give me back the blue sky and red sun! We do have a lot to do. The most important thing is to try to reduce the emission of pollutants. Smoke and dust are mainly produced by the incomplete combustion of coal and oil. Improving the combustion method to ensure that the fuel is fully burned can greatly reduce the amount of smoke and dust generated. Coal, develop coal gasification and liquefaction, and the fuel containing a lot of ash and sulfur must be washed, processed and reused. The generated pollutants must be recovered and processed through absorption, catalysis, adsorption, condensation and other methods to turn harm into benefit. , reuse. Even if the pollutants are released into the atmosphere, we must try to reduce their harm. We must strengthen urban greening, plant more flowers and trees, and open more parks and boulevards to prevent global pollution. From a warming perspective, to control the growth of greenhouse gases, especially carbon dioxide, we should try to use natural gas as fuel. If we can eliminate small chimneys in each household and implement centralized heating or joint production of power supply and heating, we can save fuel. and reduce carbon dioxide emissions. If the amount of secondary aluminum used in various countries around the world is doubled, it will reduce the amount of pollutants emitted into the atmosphere by 1 million tons a year. There are more than 400 million cars in the world. Approximately 1.83 billion tons of carbon dioxide are emitted every year. In order to reduce greenhouse gas emissions from cars, in addition to limiting the number of cars, saving fuel consumption, and installing purification devices, we must also try relatively clean fuels such as methanol and ethanol, and develop public transportation. Transportation and electric vehicles. Finally, the development and utilization of clean new energy sources is the most fundamental way to reduce air pollution. Energy sources such as nuclear energy, solar energy, wind energy, biomass energy, and geothermal energy are clean, abundant, and have great development prospects. The destruction of the ozone layer is a global problem. The United Nations Environment Conference decided to gradually stop the production of chlorofluorocarbons, the "culprits" in destroying the ozone layer, by the end of 1995. However, the lifespan of chlorofluorocarbons is 50 to 100 years, and they have been depleted. Of the 15 million tons of chlorofluorocarbons in the atmosphere, only a small part has damaged the ozone layer so far, and most of the rest are still in action. The ozone layer will continue to be damaged and will reach its peak in the first decade of the next century. It will take at least a century to fully return to normal natural levels! Air pollution is caused by human activities, and it will ultimately be solved by humans. But time waits for no one. We'd better take decisive action from now on. Measures to purify the atmosphere and give us blue skies

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