Hollywood loves Doomsday, film producers have through the years looked at the popularity of this genre as a way to make money. However, there are some truths in these films. In an article from CBSNEWS, scientists concluded there were 9 possible ways that life on Earth could end.

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9 WAYS THE EARTH COULD
END ACCORDING TO
SCIENCE

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ABOUT
HOLLYWOOD LOVES DOOMSDAY.
Film producers have through the years looked
at the popularity of this genre as a way to
make money. However, there are some truths
in these films. In an article from
CBSNEWS, scientists concluded there were 9
possible ways that life on Earth could end.

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1. CLIMATE CHANGE
The mother of all apocalyptic fears, climate change is the biggest threat facing the
planet, many scientists say. Climate change could make extreme weather more
severe, increase droughts in some areas, change the distribution of animals and
diseases across the globe, and cause low-lying areas of the planet to be submerged
in the wake of rising sea levels. The cascade of changes could lead to political
instability, severe drought, famine, ecosystem collapse and other changes that make
Earth a decidedly inhospitable place to live.

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2. ASTEROID!
It's the mainstay of disaster movies, but
scientists are legitimately worried that a space
rock could wipe out Earth. A meteor impact
probably doomed the dinosaurs, and in the
Tunguska event, a massive meteoroid
damaged about 770 square miles (2,000
square kilometers) of the Siberian forest in
1908. Even more frightening, perhaps, is that
astronomers only know about a fraction of the
space rocks lurking in the solar system.

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3. PANDEMIC THREAT
New deadly pathogens crop up every year: Recent pandemics have included
outbreaks of SARS (severe acute respiratory syndrome), bird flu, and, most
recently, a coronavirus called MERS that originated in Saudi Arabia. And because
of our highly interconnected, global economy, a deadly disease could spread like
wildfire. "The threat of a global pandemic is very real," said Joseph Miller, co-
author (along with Ken Miller) of the textbook "Biology" (Prentice Hall, 2010).

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4. FUNGUS AMONG US
Though bacterial threats are dangerous, fungal threats are even scarier, said David Wake,
curator at the Museum of Vertebrate Zoology at the University of California, Berkeley.
"We've had a new amphibian fungal disease that has just had devastating effects," Wake
said of the chytrid fungus that is wiping out frogs across the United States.
An equally fatal fungus in humans would be catastrophic. And though bacteria are
deadly, antibiotics are plentiful. By comparison, we know much less about treating
fungal infections, Wake told LiveScience.

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5. ENGINEERED DISEASE
Natural diseases aren't the only ones to fear.
In 2011, the scientific community was outraged that researchers had engineered a
mutant version of the bird flu H5N1 that was transmissible in ferrets and transmitted
via the air. The results sparked fears that engineered deadly diseases could
inadvertently escape from the lab or be intentionally released, leading to a global
pandemic.

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6. NUCLEAR WAR
Many scientists are still worried about the classic end-of-the-world threat: global
nuclear war. Beyond North Korean leader Kim Jong Un's saber rattling and Iran's
secretive nuclear efforts, massive stockpiles of nuclear weapons around the globe
could wreak destruction if they were to get into the wrong hands. Last year, the
Bulletin of the Atomic Scientists, a nontechnical magazine on global security founded
in 1945 by former Manhattan project physicists, moved the Doomsday Clock, at five
minutes to midnight. The Doomsday Clock shows how close humanity is to
destruction via nuclear or biological weapons or global climate change.

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7. ROBOT ASCENSION
"The Terminator" may be science fiction, but killing machines are not far from reality.
The United Nations recently called for a ban on killer robots -- presumably because
experts worried that several countries were developing them.
Many computer scientists think the singularity, the point at which artificial
intelligence overtakes human intelligence, is near. Whether those robots will be
benevolent helpers or the scourge of humanity is still up for debate. But a lot can go
wrong when there are hyperintelligent robots armed with lethal weapons running
around.

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8. OVERPOPULATION
The fear of an overpopulated globe has been around since the 18th century, when
Thomas Malthus predicted that population growth would cause mass starvation and
overtax the planet. With the global population at 7 billion and counting, many
conservationists think population growth is one of the key threats to the planet. Of
course, not everyone agrees: Many think population growth will stabilize in the next
50 years, and that humanity will innovate its way out of the negative consequences
of the overcrowding that does occur.

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9. SNOWBALL EFFECT
Though each of these scenarios could happen, most scientists think a snowball effect
of multiple events is more likely, Miller said. For instance, global warming could
increase the prevalence of pathogens while also causing widespread shifts in climate.
Meanwhile, ecosystem collapse could make it slightly harder to produce food, with
no bees to pollinate crops or trees to filter agricultural water. So, instead of an epic
catastrophe, several relatively small factors would slightly worsen life on Earth until it
gradually degraded, Miller said.
In that scenario, the downfall of Earth is not dramatic, "like being attacked by a saber-
toothed tiger," Miller told LiveScience. "It's more like being nibbled to death by
ducks."

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