From the moment our ancestors picked up tools, humans have been the masters of the earth, from primitive tribes to steel forests, to what extent have humans influenced the world?
How would the world change if one day all 7 billion people in the world disappeared? How long would it take Mother Earth to clean up the traces of human existence?
In fact, the Earth would react strongly immediately after the disappearance of human beings. The first second after the disappearance of human beings, first of all, the human body would emit heat, and in Beijing, for example, the disappearance of 20 million people would reduce the temperature of the city by about 2.5 degrees.
Six hours later, power plants are left unsupervised and the world is plunged into darkness with a blackout. Pets began to feel hungry and resourceful zoo animals escaped their cages. Chemical plants around the world catch fire and explode one after another, and global disaster continues.
Three days later, tens of thousands of tons of toxic chemicals will be leaking from the factories, causing very serious pollution; pets are becoming more and more desperate, and those who can't escape from their homes can only wait for death.
Four days later, the pumps of the sewage treatment plant stop working, and untreated human waste flows into the lakes and rivers, backing up the sewage and killing the wildlife that depends on the rivers and lakes.
A week later, pet dogs eating canned food become predators, ganging up to fight for territory, hunting small animals and even other small dogs in packs, and small dog breeds bred by humans for their own enjoyment face extinction.
Nuclear power plants run out of fuel for their diesel engines and leak large amounts of radioactive material, causing radiation 500 times higher than that from the Hiroshima bomb; pumps are left unsupervised, and subways and other underground buildings will be flooded.
Fifteen days later, the water used to cool the plant evaporates to nothing, and one nuclear explosion disaster after another occurs around the world, with deadly radiation spewing out of the plant, and the worst of the damage will last for 240,000 years.
Large animals have fled the contaminated areas, all the plants in the heavily contaminated areas have died from radioactive poisoning, and thousands of animals have died from radiation-induced cancers; supermarkets will be overrun by rats, and cats will gather to prey on them.
Three months later, with less human exhaust pollution, the city would receive less rainfall, the air would be cleaned up considerably, and visibility would increase more than fivefold.
The world's automobiles emit seven billion tons of carbon dioxide every year, and one year after humans have disappeared, these greenhouse gases are gone, global warming has slowed; moss grows on the highways, and nature returns.
Five years from now, once-famous street buildings will be covered with weeds and trees, herbivores will follow the vegetation, carnivores will follow the herbivores, and the city will be overrun by wildlife.
Thirty years from now, artificial satellites will fall to the surface like meteors, animals will chew through roofs and walls, ceiling floors will gradually rot, buildings near the sea will be blown down by typhoons, and human dwellings will slowly collapse.
Seeds take root in forests of steel and concrete, streets are nothing but plants and shards of glass, 750 million birds die each year around the world from crashing into glass windows, bird populations rebound; concrete erodes.
100 years later, skyscrapers collapsed into broken bricks; undulating waves absorbed carbon dioxide into the upper layers of the oceans, and plankton absorbed the carbon dioxide into their bodies, and global warming ended; ecosystems gradually recovered, and wildlife populations grew dramatically.
300 years later, the Eiffel Tower, a steel building, collapses from corrosion; the Three Gorges Dam is washed away.
10,000 years later, the earth is covered by natural ecology, and the cities and all traces of where mankind once lived will disappear, except for a few stone buildings, the pyramids, the Great Wall, and the Presidential Hill, which will be the only remaining imprints of mankind.
50 million years from now, the only thing that exists that has anything to do with mankind is plastic, and it will take another 50 million years for nature to completely degrade plastic.
So it's clear that the Earth is self-healing, and that human civilization has been a blip on the radar for 4.55 billion years of Earth's life.