Human Race vanished : You are one of 7.6 billion people on earth . But what's that mean? How can those 10 digits properly reflect the size of our species? To better understand the presence on Earth we consider a variety of tactics like how many emails were sent per day, how many cars are present on the road etc. Suddenly Human Disappears: If all humans disappeared life would flourish. If Human Race Vanished suddenly from the Earth it will cause chaos , aeroplanes, trains, and automobiles without drivers will collide, derail, and fall from the sky. Within the first hour mass blackout will start to occur across the globe. Electricity generated from the coal plant would fail once fuel ran out. Wind and water power systems would also shut down without human supervision. The next day the computers would act on their own accord to shut down the nuclear reactor in order to prevent disaster . The world would be completely without power. 
London's big bang will ring for the last time, since it needs to be round every three day.
The city will be populated with the roaming animals. The pets and zoo animals should have to break free or have to suffer starvation.
Within 10 days security measures in nuclear power plants would finally fail, setting off a chain of explosions and realising toxic radiations all over the earth.
Water life:
The water life in affected areas might die but other species get prevelage. The water quality and cooling water would increase. And in a month the water would get clean and life inside it would get better.
Animals Life:
Domesticated animals and wild animals' lives also get affected . Domestic animals have to break free themselves else they have to suffer starvation. The wild animals would be free to roam in the cities freely.
The pets roam in search of food. Supermarkets will be full of rats and mices , pets will eat everything they get to satisfy their hunger.
The cities in some years will look like natural theme parks. Nuclear radiation would clear and vegetation would sprout all over the city. Moss will take over the streets, trees and flowers will travel up to long abandoned towers.
After 30 years the satellites we set up to explore would fall down to earth with no one to collect data. Homes and skyscrapers would have collapsed . And in some coastal areas the entire city will be reclaimed by the sea. All ships sank down the sea and the foundation of new coral reefs took place.
Global warming would continue after the 4 years we have gone. The temperature will rise , the environment will improve drastically.
After 60 years marine life will recover itself, which has been damaged due to fishing. And in 150 years the urban environment will be restored to its natural environment as it was before humans. In 500 years the forest would be the healthiest than ever, the northern areas will be covered by layers of snow. And in 1000 years the Earth will recover itself by every damage which was caused during human existence.
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