Compared with the vast universe, the earth is small. It's so big, it doesn't grow up. The surface area of the earth is 5 1 10,000 square kilometers, and the land inhabited by human beings only accounts for about one fifth of it. Therefore, the living space of human beings is extremely narrow, and there is no room for human beings to squander.
All kinds of resources on the earth are also limited. The water resources, forest resources, biological resources and atmospheric resources needed by human life could have been regenerated and contributed to human beings for a long time. However, because people destroy natural resources at will and abuse chemicals recklessly, it can't be regenerated, and it also causes a series of ecological disasters, which poses a serious threat to human survival.
Therefore, in order to protect the earth, human beings must protect the environment, save resources and care for nature, which is a sacred duty.
Extended data:
"There is only one earth", which was a resounding slogan put forward by 1972 at the human environment conference held in Stockholm, Sweden.
This paper introduces the knowledge about the earth from the perspective of human existence, clarifies the fact that there is only one earth for human beings, and calls on human beings to cherish resources and protect the earth.
The earth was born 4.54 billion years ago, and life was born within 1 100 million years after the earth was born. The earth's biosphere changed the atmosphere and other environments and formed the ozone layer. Together with the earth's magnetic field, the ozone layer blocks harmful rays from the universe and protects life on land. It can be said that the earth is the umbrella of mankind.