Earth s past, present, future. Future Earth Changes

In the past, there were many small animals living on the earth, with green trees everywhere, blue sky, white clouds, accompanied by wisps of fresh breeze, and the environment was very beautiful! However, now the earth has changed, many animals are endangered, environmental pollution is very serious, you can see garbage everywhere, with the frequent occurrence of sandstorms, the greenhouse effect is serious, in the future, scientists will call for more people to protect the earth, love the earth, so, the future of the earth will become better.

Good boy, write as wildly as your imagination as you can.

In 200 million years, the average winter temperature on Earth will be about minus 4, and the temperature will rise in all seasons1.

After 300 million years, the hottest temperature on the earth's surface is now about 40, and the temperature in winter is no longer -5*

400 million years later: now the hottest temperature on the earth in summer is as high as 42 And spring, is no longer the most beautiful season to tease the mountains and suns, how can spring be like the current summer, maybe the current February is very cold, when the time comes now the cold February, for the earth after 400 million years there will be 20 high temperatures, 1 billion years later: the sun has reached middle age, now the highest temperature on the earth can reach 60, the ocean has gradually evaporated, the earth is no longer a paradise in the solar system, After 3.8 billion years:

The Andromeda Galaxy is hurtling the Milky Way at 400,000 kilometers per second, which is not far from each other in the 21st century. 2.5 million light-years away, 5 billion years later, the sun is now expanding. In less than 200 years, the Earth will be swallowed by the unprecedented red giant Sun, which will vaporize and turn the Sun into a white dwarf.

Our past

When you were a child, did you ever wonder how many people have lived on Earth from ancient times to the present?

Let's not start with "Lucy". Let's assume that modern humans are counting from 200,000 years ago.

Demographers estimate that about 109 billion people have lived and died in those 200,000 years.

These 109 billion people, the traces of their lives must be inherited in some form. The language we speak, the food we eat, the ** we like, the tools we use, the house we live in, etc., etc., etc.

Our now

By 2022, we will have 100 million people living on Earth. Add to that those who have died, and about 117 billion people have been born since the dawn of modern humanity.

This means that the people who are alive now account for about all the people who were ever alive.

It's a huge hourglass. The difference is that it does not measure the passage of time, but the passage of people.

Every grain of sand here represents 10 million people: 100 million babies are now born every year around the world. So 14 grains of sand were added on top of the hourglass. 60 million people die each year; Six grains of sand passed through the hourglass and flowed to the deceased person underneath the hourglass.

Our future

How many people will be born in the future? How many descendants are we likely to have in the future?

We are mammals. One way to think about how long we might survive is to look at how long other mammals as species can survive.

It turns out that the lifespan of a typical mammal as a species is about 1 million years. Let's assume that humans can also live for 1 million years: now 200,000 years have passed, so there are 800,000 years to go.

Let's consider a scenario where the population stabilizes at 11 billion (based on the UN's estimate of the population at the end of the century**) and the average life expectancy increases to 88 years.

So that in the next 800,000 years, 100 trillion people will come to Earth.

Dinosaurs have no defenses against asteroids that destroy them. Humanity now has a well-funded asteroid monitoring system, and if necessary, may be able to deploy technology to protect us from impending asteroids.

But perhaps the greatest challenge and threat to humanity does not come from outer space.

The nuclear yield currently in service worldwide could kill millions of people and billions in the "nuclear winter" that followed.

Its potential threats include climate catastrophes, mega-pandemics, and artificial intelligence.

Realize that the vast majority of humanity will live in the future afterward. It has invisibly increased a sense of responsibility for me, a modern person.

The idea that we're going to be the ancestors of a whole group of people is interesting. The pencil for us is in their hands, and I have to make sure I'm a good ancestor! (Update).