How long can humans live on Earth, and how many years have humans lived on Earth

？This involves not only the strategy of sustainable development, the resources provided by the earth for the survival and development of human beings, but also the number of years in which the earth's external environment can be maintained.

The sun is the most important factor in determining the Earth's external environment. According to modern astronomers, the Sun will continue to provide light and heat to the Earth in a continuous and steady manner, and the average radius of the Earth's rotation around the Sun will remain constant for a long time, with at most minimal oscillations, and this process will continue for at least another 4 billion years. After 4 billion years, the Sun will gradually expand and evolve into a red giant, eventually swallowing the Earth completely into its "belly".

The influence of the sun on the earth is so great that "as soon as the sun roars, the earth immediately trembles". As for human beings, they can't withstand any shaking of the earth! However, there is no problem that the sun will continue to provide light and heat to the earth for 40 million years, because in 40 million years, it consumes less than 1% of the sun's total energy!

Therefore, to study the sustainable survival and development of human beings on the earth, we must at least aim to be able to survive on the earth for at least 40 million years!

But the real threat to humanity comes from humanity itself. If Galileo was considered the father of modern science 400 years ago, then the development of science, technology, industry and agriculture in these 400 years far exceeds the achievements of the 4 million years since the beginning of human history. At the same time, the resources consumed on Earth in the last 400 years have greatly exceeded the total amount of resources consumed by humans in 4 million years!

If we continue to develop according to the current trend of increasing consumption, what will the earth look like in 4,000 years or even 40 million years?

The earth's resources can be divided into two categories: those that are renewable and those that are non-renewable. Although human beings can replenish some non-renewable resources by consuming renewable resources, there is a limit to the amount of this after all.

Therefore, the question of the survival and development of human beings will ultimately depend on how many years the earth's resources can sustain the normal life of human beings according to the consumption standards of certain resources.

In fact, 40 million years is just a conservative statement, the sun's light and heat, it is entirely possible to last for a longer time, even if there are some abnormal events in the solar system, such as an asteroid hitting the earth, it is unlikely to happen within 40 million years, and people can launch super-destructive missiles to make the asteroid change course; Therefore, the inhabitants of the earth, at least for a long time, do not need to "worry about nothing and the sky"!

But what really worries is man, whether man can control himself! 1 This paper addresses the question of "" from three aspects, one is whether the sun can provide light and heat to the earth continuously and stably, and the other is

4. Analyze the punctuated words in the following sentences as required.

2) "But what really worries is man, whether man can control himself!" Tell me what it means to "control humanity itself."

I don't know very well.

The key is to see how long the earth's resources can last.

Soon the aliens are going to attack Earth

The world's earliest ape-man fossil was discovered in 1891 on the island of Java, Indonesia, dating from 60 to 800,000 years ago. The Javanese ape-man, together with the Peking man discovered in Zhoukoudian, China, in 1927, was once recognized as the "earliest" human in the world. At that time, it was believed that the history of mankind was no more than 100,000 years old, and the first human beings appeared in Asia.

The Shandong Yiyuan ape man, discovered in China in 1981, belongs to the same era as the Beijing ape-man. However, this theory of the earliest origin of human beings has been overturned by two archaeological discoveries in China. After the liberation, archaeologists successively found ape-man fossils in Lantian in Shaanxi Province and Yuanmou in Yunnan Province.

The Lantian ape-man is 1 million years old, and the Yuanmou ape-man is 1.7 million years old. So, how long is human history? In the last two or three decades, archaeologists have discovered many ape-man fossils on the African continent, giving us a new understanding of human history.

In 1959, an almost complete fossilized ape-man skull and labor tools were found in Tanzania, dated to 1.75 million years ago. In 1972, fossilized ape-man skulls, leg bones and stone tools were discovered in Kenya and dated to 2.6 million years ago. In 1973, it was reported that fossils of ape-man were found in Ethiopia about 3 million years old or 3 million years ago.

From this point of view, human history is not 800,000 years, nor 1.7 million years, but more than 3 million years. As for the earliest place of human appearance, it remains to be determined by more archaeological discoveries.

This is a very uncertain question, because there are many possibilities for human beings to live on Earth in the future, and if World War III breaks out, then human beings may not be able to survive for decades or even years; If we are lucky enough to be able to live in peace on Earth, but according to the current level of environmental damage, human beings will probably only survive for a few hundred to one or two thousand years; If the situation is more ideal, human beings can not only coexist peacefully, improve the moral standard of civilization, but also solve the problems of the earth's environment, then the life of human beings will be greatly extended.