How
the world would look like without humans? this question appears to be somewhat
childish, because there are approximately 7.8 billion people are living on this
earth as of March 2020. It seems to be impossible for humans to vanish
suddenly. To be very frank, this is nothing but an imagination of scientists.
An
American film, I am a legend, can truly represent this situation. In this film,
scientists unintentionally created a lethal virous and thereby killing most of
the humans, leaving some of them extremely vulnerable to ultraviolet rays of
the sunlight and remaining few were immune to the virus. In our case, let's
suppose no man survive the danger and humanity completely become extinct.
Who will
know the first?
The
artificial satellites orbiting around the earth, will be the first to know the
end of humanity from the world. Because sky remains brighter during the night
in many places but no one will be there to maintain thermal power and
electricity tools. After a few hours, detecting a drop in usage, nuclear power
systems will go to automatic safety mode and stop producing power.
Fossil
fuel plants will stop working after running out of fuel, wind turbines and
solar panels will no longer remain functional without proper maintenance. The
whole world will be plunged into deep darkness and satellites will collect this
information.
Many
animals will die within weeks
Millions
of house pets, farm and zoo animals who are not used to hunt down for
themselves, will starve and die within a few weeks. The animals manage to
survive hunger, will be killed by stronger animals. Also rats, cockroaches,
bees and other insects who rely on human activities will lost their lives.
Without power and maintenance, sewage will pollute the surrounding lakes and
river, may also poison a large number of animals.
Failure of
chemical/gas plants and nuclear explosions
Chemical
plants used for manufacturing will fail and chemicals can release in the form
of dangerous gasses. they may cause a mini nuclear winter after entering into
the earth's atmosphere. Much like chemical plants, Natural gas plants would
fail without humans to take care of them. The gasses would begin to vent and
may eventually reach our fuel reserves causing explosions and fires that will
burn for days.
Finally,
Nuclear plants will melt down after emergency generators run out. Cooling pools
will be evaporated and temperature will exceed its limits causing mass nuclear
explosion far worse than Hiroshima and Nagasaki. Dangerous radiations would
span the globe for thousands of years.
The
lands will become barren for years. All the living things near the thermal
power plants will be extinct. However, Creatures living in distant mountains,
forests and seas will survive these explosions.
Sea levels
rise
The
humans who use billions of billions of liters of water every day, will not be
there. As a result, sea waters will be raised from ground level. Nearby cities
and structure will be flooded and finally fall down to the ground.
The air
will be clearer
Factories
and industries producing dangerous chemicals and gasses will cease to exist,
airplanes, cars and other vehicles will stop polluting the environment and
atmosphere will be cleaned. With the reduction of carbon and other chemicals,
the air will become more clearer and the stars, which are not visible due to
the environmental pollution, will begin to appear but unfortunately, no one
will remain alive to see them.
Homes and
buildings will crumble
After
a few years, Homes and buildings, survive the disasters discussed above, will
start to fall down to the ground. They will be converted in ruins and piles of
rubbles. Mushrooms and other vegetations will hollow out them and roads will be
covered with moss and grass. Within a few hundred years, the cities and forests
will be undiscernible from one another.
Animals
will rule the world
Due
to the absence of humans, animals will start appearing in the cities and there
will be animals everywhere. According to a report, 90 percent population of all
large fishes have been disappeared from the world's oceans in the half past
century. So, after the human exit, aquatic animals will also begin to flourish.
After a few hundred years, House pets will be killed by wild animals and
remaining few will take the form of their ancestors living on the earth before
humans.
According
to some scientists, after the mass exit of humanity, there will be a war
between animals to take the place of humans. Chimpanzees will be first amongst
them, as humans share about 98 percent of their DNA with them, making them
their closest living relative.
Long term
changes
After
hundred years, houses, buildings and every man-made thing had been demolished.
maybe some strong buildings and rocks will be taking their last breath. Five
hundred years later, no evidence of cities will remain. After ten thousand
years, there will be no harm of global warming and earth's temperature will be reduced
by 2.5 percent.
Ice
will be increasing in the north pole and seas will become icy. There will be no
evidences of nuclear plants on the earth. Once man used to live in the world?
nothing will remain to answer this question.
What
will be left behind? electromagnetic radiations! yes, Amazingly, the signals we
sent in the space and fragments of telephone, radio and television signals will
remain forever leaving the clues for future interstellar explorer to decipher
about the beings that once walked planet earth.
At
last, these are all the assumptions and imaginations of the scientists, just
like countless others. But these estimates are based upon the threats
technological progress have posed to the humanity. For instance, we are familiar
with the consequences of a nuclear explosion or power breakdown. It is
understood that our systems will collapse in a blink without proper human maintenance.
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interesting topic to read
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