With the development of the world economy, environmental problems around us have become increasingly prominent. Design an environmental slogan or a logo and briefly introduce your design ideas

The environmental problems that have threatened human survival and been recognized by humans so far include: global warming, ozone layer destruction, acid rain, freshwater resource crisis, energy shortage, sharp decline in forest resources, land desertification, Accelerated species extinction, garbage disasters, toxic chemical pollution and many other aspects. (1) Global warming: Global warming refers to the increase in global temperature. In the past 100 years, the global average temperature has experienced two fluctuations: cold-warm-cold-warm, which can always be seen as an upward trend. After entering the 1980s, global temperatures have increased significantly. From 1981 to 1990, the global average temperature increased by 0.48°C compared with 100 years ago. The main cause of global warming is mankind's extensive use of fossil fuels (such as coal, oil, etc.) over the past century, which has emitted large amounts of CO2 and other greenhouse gases. Because these greenhouse gases are highly permeable to short-wave radiation from the sun, and highly absorbent to long-wave radiation reflected from the earth, which is often called the greenhouse effect, it leads to global climate warming. Global warming The consequences will be redistribution of global precipitation, melting of glaciers and permafrost, rising sea levels, etc., which not only endangers the balance of natural ecosystems, but also threatens human food supply and living environment. (2) Destruction of the ozone layer: near the surface of the earth's atmosphere. There is an ozone layer in the stratosphere about 20 to 30 kilometers away. The ozone content accounts for one hundred thousandth of the total gas at this altitude. Although the ozone content is very small, it has a strong ability to absorb ultraviolet rays. Therefore, it can. Block the damage caused by the sun's ultraviolet radiation to the earth's organisms and protect all life on the earth. However, some pollutants are emitted from human production and life, such as chlorofluorocarbons in refrigerants of refrigerators, air conditioners and other equipment, and fluorobromocarbons for other purposes. Compounds such as these can be intensified when exposed to ultraviolet rays, forming highly active atoms that interact with ozone (O3) in the ozone layer, turning them into oxygen molecules (O2). This reaction occurs in a chain, and ozone is rapidly depleted. The ozone layer over Antarctica has been depleted in 2 billion square kilometers. Formed, it was destroyed by 60% within a century. The ozone layer over the Northern Hemisphere is also thinner than ever before. The ozone layer over Europe and North America has decreased by 10 to 15% on average, and it has even decreased by 35% over Siberia. Scientists warn that the degree of destruction of the ozone layer above the earth is much more serious than most people imagine. (3) Acid rain: Acid rain is caused by acidic pollutants such as sulfur dioxide (SO2) and nitrogen oxides (NOx) in the air. 5.6 acid precipitation. In areas affected by acid rain, acidification of soil and lakes occurred, destruction of vegetation and ecosystems, and corrosion of building materials, metal structures, and cultural relics. Acid rain caused a series of serious environmental problems in the 1950s and 1960s. It first appeared in Northern and Central Europe. At that time, the acid rain in Northern Europe was caused by the migration of acidic exhaust gases from industries in central Europe. Since the 1970s, many industrialized countries have taken various measures to prevent and control air pollution in cities and industries. One of the important measures is to increase the thickness of chimneys. Although this measure has effectively changed the quality of the atmospheric environment in the emission area, the problem of long-distance migration of atmospheric pollutants is more serious. Pollutants cross national boundaries and enter neighboring countries, and even float long distances, forming a wider Transnational acid rain. In addition, the use of fossil fuels around the world has continued to increase, which has further expanded the areas affected by acid rain. In the 1980s, acid rain mainly occurred in my country. In the southwestern region, by the mid-1990s, it had developed to the vast areas south of the Yangtze River, east of the Qinghai-Tibet Plateau and the Sichuan Basin. (4) Freshwater resource crisis: Although 2/3 of the earth's surface is covered by water, 97% is waterless. Less than 3% of drinking seawater is fresh water, of which 2% is stored in polar glaciers. Of the only 1% fresh water, 25% is industrial water, 70% is agricultural water, and only a small part is available for drinking and other domestic purposes. However, in such a water-scarce world, water is widely abused, wasted and polluted. In addition, uneven regional distribution has made water shortages common in the world, and the global freshwater crisis is becoming increasingly serious.

Currently, more than 100 countries and regions in the world are short of water, and 28 of them are listed as severely water-scarce countries and regions. It is predicted that in the next 20 to 30 years, there will be 46 to 52 countries and regions with serious water shortages, and the water shortage population will reach 2.8 to 3.3 billion people. my country's vast northern and coastal areas are seriously short of water resources. According to statistics, the total area of ??water-scarce areas in northern my country reaches 580,000 square kilometers. Among more than 500 cities in the country, more than 300 are short of water, with an annual water shortage of 5.8 billion cubic meters. These water-scarce cities are mainly concentrated in North China, coastal and provincial capital cities, and industrial cities. No living thing in the world can do without water, and people aptly describe water as the source of life. However, with the surge in population on the earth and the rapid development of production, water has become more precious than ever before. Some The depletion of rivers and lakes, the depletion of groundwater and the disappearance of wetlands not only pose a serious threat to human survival, but also many organisms are becoming extinct due to river diversion, wetland drying and ecological environment deterioration caused by human production and life. Many large rivers, such as the Colorado River in the United States and the Yellow River in China, have lost their glory. The magnificent scene of "running to the sea and never returning" has become a historical memory.