Why is the sky in foreign countries so blue and the water so green?

In the movie "See You or Be Parted", Liu Yuan "takes root" in a grassland, where there are not only dreamy natural beauty - blue sky, clear water and green trees, but also easy-to-hand industrial enjoyment - car TV, running water, Even beer. Many viewers caught the glimpse and lamented that the United States is really a paradise country. The material civilization and spiritual civilization that mankind has achieved so far are gathered together in the United States. That piece of grass is just a "commonplace thing" seen everywhere in the United States. But the United States has not always been as beautiful as a dream since the founding of the country in 1776. Looking back at the history of environmental protection in the United States, the environmental protection in the United States can be summarized in the following four aspects: strong family background, quick awakening, many capable people, and good democracy. First of all, the family background is strong. Like China, the United States' main territory is located in the northern temperate zone between 25° and 45° north latitude, which is the most suitable for human habitation. It is not inferior to China in terms of natural geographical conditions, territorial size and distribution of natural resources. And because it is close to two oceans, the climate is humid (the national average rainfall is more than 30% higher than that in China), there are many plains (the proportion of land suitable for farming is as high as 90%, and the proportion of plains is more than 70%), there are few deserts, and the population density is as high as The population distribution is reasonable, and it is already in the ecological recovery stage of late industrialization described by the environmental "Kuznets Curve". Now it can be regarded as a truly outstanding place with outstanding people and natural treasures. It is still a net producer of major global resources, but it still has a beautiful homeland. There is an indispensable reason for this, and that is to wake up quickly. As a former New World and a country of immigrants, the United States has painted the latest and most beautiful picture on this blank sheet of paper in more than 200 years. However, it should be noted that this picture is an oil painting painted in layers, and the first few layers are also terrible. The earliest aborigines in the United States, the Indians, lived in a safari civilization that was harmonious between nature and man. Therefore, the 20 million square kilometers of the North American continent were not even disturbed by agricultural civilization and maintained a good original ecology. One of the best wildlife paradises up there. After the 17th century, new immigrants from Ireland first brought farming civilization to the Atlantic coast. After the United States won the Revolutionary War, this territory (the original 13 states) quickly began the process of industrialization. The mineral deposits in the Appalachian Mountains were dug out, and urban pollution and ecological destruction became the main tone of the East. Immigrants who were crazy about getting rich continued to march westward, not only destroying the original habitats of Indians on a large scale in industrial and agricultural production, but also killing bison and even developing it into a pure game. The once overwhelming American bison were less than 200 years old, and by 1889 there were only 541 left. In short, the United States in the 19th century was not filled with flowers and riches, but with enthusiastic and desperate money-worshiping immigrants, smoky and sewage-filled factories, and farms that "razed everything and started over" (Similar scenes also occurred in Japan in the 1960s and China in the 1980s). This crazy economic growth lasted until the 1930s. When the Great Depression (economic crisis) in the social field and the Black Storm (ecological crisis) in the natural field took their revenge, it gradually returned to rationality. This process of return is also a long-term one. Until the 1940s and 1950s, two of the world's eight major pollution incidents occurred in the United States - the Donora smog incident and the Los Angeles photochemical pollution incident. In the 1950s and 1960s, due to the excessive use of pesticides and chemical fertilizers, Leading to the "Silent Spring", even the bald eagle, the national bird of the United States, was almost extinct due to habitat destruction caused by agriculture and breeding disorders caused by pesticide accumulation! The "beauty" of America today has actually just arrived.

It’s just that the vast majority of Chinese people only had the opportunity to see the true face of the United States after 1980, so what they saw was a dazzling and clear picture