Conservation efforts have existed for hundreds of years. Their aim was always to prevent or control the effects of man's heavy exploitation of a particular natural resource. This normally took the form of excessive hunting in an area, which moved some authorities to use their power to counteract(抵制)the extinction of animal populations.
It was not until 1872 in the state of Wyoming, that the first National Park was created as "a public park and pleasuring ground for the benefit and enjoyment of the people". This was the famous Yellowstone National Park, whose breathtaking volcanic rocks(驚人的火山岩)and gorges(三峽) still afforded the same magnificent spectacle(壯觀) as in neolithic times(新石器時期), untouched by the hand of man. Its creators wanted to conserve the natural environment for the purposes of scientific research and for the enjoyment of visitors. But why was it in Amethica and not in Europe, then culturally more advanced, that the idea of National Parks was born?
In Europe, the industrial and agricultural revolutions had occurred gradually. Factories were localized around available energy resources, and agriculture had developed steadily in harmony with the countryside. In the United States, technological advance was uniquely different. It was in only a few decades that pioneers of exceptional determination and dynamism invaded immense open spaces whose aboriginal inhabitants had until then lived in harmony with the environment. The American