After 30 years of immigration

Today's earth, with the beginning of the industrial revolution more than 200 years ago, has already entered the explosion stage of population growth. So, do you know how many people lived on the ancient earth?

According to modern research, the earliest human beings appeared about 2 million years ago. However, Homo sapiens, the direct ancestor of modern humans, only appeared hundreds of thousands of years ago. If it is the time of late Homo sapiens, it will be even later, about 50 thousand years ago.

Of course, it is still difficult to estimate the number of early humans. However, when ancient humans entered the agricultural society about 6.5438+million years ago and their lives gradually stabilized, researchers thought that the total population of the earth was about 500 million.

This means that in just 10,000 years, the population of the earth has increased by 7.3 billion people. So, how did so many people grow up bit by bit?

In fact, in ancient times, although the fertility rate of human beings was much higher than now, the mortality rate of newborns was very high and the average life expectancy of people was relatively low, which led to the constant birth of newborns, but the population did not increase much and the plague was rampant. Until more than 500 years ago, the total population of the earth was incubating eggs, about 500 million people.

The real change began after17th century. At this time, with the development of mankind, the living standard has also been greatly improved. Therefore, in just 200 years, the number of human beings has reached10 billion.

In the 20th century, the population grew faster. Around 1927, the global population exceeded 2 billion. Since then, although the population growth slowed down due to World War II, after the end of World War II, the world population exceeded 3 billion in 1959. 1999 exceeded 6 billion, and only 10 years later, it added 10 billion people.

Research shows that in two years or so, that is, around 2023, the world population will exceed 8 billion, and in 2057, this number will become 654.38+000 billion.

Then, under the background of huge population growth, will the resources on the earth really be consumed by human beings? For this problem, the researchers believe that at present, we don't need to worry.

Will population growth consume the resources of the earth?

Speaking of it, in the 2 1 century, human beings began to emigrate to other planets as soon as possible, hoping to find new energy sources, because the resources on the earth will not be used for long, and relying on traditional resources will lead to the deterioration of the ecological environment on the earth.

Take the oil resources on the earth as an example. As early as a few years ago, some researchers said that the oil resources on the earth would be completely exhausted before the end of this century. However, scientists from the United States believe that the oil resources on the earth will last for at least 500 years.

But even so, 500 years is very short in the long history of human evolution. Unless new energy sources are found in 500 years, human beings will be completely exhausted in 500 years.

Of course, in fact, in addition to the problem of whether the earth's resources will be exhausted, there is a crucial problem behind the skyrocketing population of the earth: the food crisis. Today, the number of hungry people on the earth is nearly 700 million, accounting for about 10%. With the future population growth, the demand for resources will be greater, and the distribution of resources may be more uneven. Naturally, there will be more hungry people on the earth.

To put it bluntly, to borrow a sentence from an ancient poem, it is "the wine and meat in Zhumen stink, and the road has frozen bones." For this problem, researchers also believe that instead of worrying about the depletion of the earth's resources caused by overpopulation, what human beings should do at this stage may be to think about how to use limited resources and allocate them reasonably to avoid excessive polarization.

At the same time, some researchers believe that when mankind enters the 22 nd century, the population growth rate on the earth will slow down, because now the fertility rate has decreased and the birth rate of newborns has also decreased. Naturally, with the decrease of the new population in the future, the population growth rate of the natural earth will also be affected.

Of course, if mankind wants to develop for a long time, the development and popularization of new energy will always be the focus. Otherwise, in the future, mankind will fall into crisis before leaving the earth. what do you think?