This ppt is about the world's apocalypse, whenever it comes. We describe what can cause the world to end, what are the dangers to be aware of etc. We also explain how to protect oneself, if unfortunately the apocalypse had happened.

1. The end of the
world is at hand

2. Introduction
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⋆ Life is resilient. The first living things on Earth appeared as far back
as 4 billion years ago, according to some scientists. At the time, our
planet was still being pummeled by huge space rocks. But life
persisted anyway. And throughout Earth’s history, it’s seen all
manner of cataclysms. Disparate doomsdays — from supernovae
blasts and asteroid strikes to huge volcanic eruptions and sudden
climate shifts — have killed countless lifeforms. And at times, those
mass extinctions have even eliminated most species on Earth.
⋆ Yet, life has always rebounded. New species emerge. The cycle
repeats.
⋆ So, what would it take to kill off life in full? Well, it turns out that while
humanity might be surprisingly fragile, it’s not easy to sterilize an
entire planet. Nonetheless, here are just a few possible doomsday
events that could permanently extinguish all life on Earth.

3. Asteroid Impact Apocalypse
• When a city-sized asteroid struck the Gulf of Mexico 66 million
years ago, it was game over for the dinosaurs, as well as most
other species on Earth at the time. And while our ancestors
hadn’t yet evolved, the impact was perhaps the single most
important event in human history.
• Humans, however, won’t always be on the winning side of such
random events. A future asteroid could just as easily take out
every person on Earth. Fortunately, that’s unlikely to happen
anytime soon. Based on the geological record of cosmic
impacts, Earth gets hit by a large asteroid roughly every 100
million years, according to NASA. However, smaller asteroid
impacts do happen all the time.

4. Death by deoxigenation
⋆ For a more likely glimpse of an Earth-altering cataclysm, we need to look to
the distant past. Nearly 2.5 billion years ago, a period called the Great
Oxidation Event gave us the breathable atmosphere we all now depend on.
An eruption of cyanobacteria, sometimes called blue-green algae, filled our
atmosphere with oxygen, creating a world where multicellular life-forms
could take hold, and where creatures like humans could ultimately breathe.
⋆ However, one of Earth’s great die-offs, an event 450 million years ago
called the Late Ordovician mass extinction, likely happened because the
inverse took place. The planet saw a sudden drop in oxygen levels that
lasted for several million years.
⋆ So, it may have happened before, but could a deoxygenation event happen
again? In an eerie comparison to today, researchers involved in the
recent Nature Communications study say that climate change is already
reducing oxygen levels in our oceans, potentially killing off marine species.
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5. Gamma-Ray Burst Extinction
⋆ Gamma Ray Bursts(GRB) are mysterious events that seem to be the most
violent and energetic explosions in the cosmos, and astronomers suspect
they’re tied to extreme supernovae. However (and thankfully), we haven’t yet
seen a burst close enough to us to fully understand what's going on. So far,
GRBs have only been spotted in other galaxies.
⋆ But if one did happen in the Milky Way, as has likely happened in the past, it
could cause a mass extinction on Earth. A GRB pointed in our direction
might last just 10 seconds or so, but it could still destroy at least half Earth's
ozone in that short period of time. As humans have learned in recent
decades, even a relatively small amount of ozone depletion is enough to chip
away at our planet’s natural sunscreen, causing serious problems. Wiping
out the ozone on a large enough scale could wreak havoc on food chains,
killing off huge numbers of species.
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6. End of the sun
⋆ The researchers suggest that our oxygen-rich atmosphere is not a
permanent feature of the planet. Instead, in about a billion years, solar
activity will cause atmospheric oxygen to plummet back down to the
level it was at before the Great Oxidation Event. To determine this, the
authors combined climate models and biogeochemistry models to
simulate what will happen to the atmosphere as the Sun ages and puts
out more energy.
⋆ They found that, eventually, Earth reaches a point where atmospheric
carbon dioxide breaks down. At that point, oxygen-producing plants and
organisms that rely on photosynthesis will die out. Our planet won’t have
enough lifeforms to sustain the oxygen-rich atmosphere humans and
other animals require.
⋆ Luckily, humanity still has another billion years to figure out other plans.
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8. Nuclear War
⋆ The Earth will not last that long if nuclear wars break out. A nuclear
detonation from one of today’s more powerful weapons would cause a
fatality rate of 80 to 95 percent in the blast zone stretching out to a
radius of 4 kilometers — although “severe damage” could reach six
times as far.
⋆ But it isn’t just the immediate deaths we need to worry about — it’s
the nuclear winter. This is when the clouds of dust and smoke
released shroud the planet and block out the sun, causing
temperatures to drop, possibly for years. If 4,000 nuclear weapons
were detonated — a possibility in the event of all-out nuclear war
between the US and Russia, which hold the vast majority of the
world’s stockpile — an untold number of people would be killed, and
temperatures could drop by 8 degrees Celsius over four to five years.
Humans wouldn’t be able to grow food; chaos and violence would
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9. Biological And chemical warfare
⋆ Unlike nuclear weapons, which require complex
engineering, biological and chemical warfare can be developed
at a relatively low cost and with relatively attainable materials.
⋆ In the past few years, the Syrian government has used chemical
weapons in the civil war that has ravaged the country. These
chemical attacks using sarin and chlorine have appalled the
international community, and underscored the damage chemical
weapons can do. Weaponized toxic chemicals could do tremendous
harm to a localized target — say, if the toxins were released into the
air or into the water supply.
⋆ Biological weapons represent a greater catastrophic threat.
Advances in synthetic biology have made very real the possibility of
malicious actors creating harmful pathogens for weaponization.
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10. Here is one interpretation of when we’ll run out of each
metal or energy source.
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11. Can we survive An
apocalypse?
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⋆ In the end, no amount of research can do much to
prevent or mitigate supervolcanoes, or other freak events
such as nearby supernova explosions and cosmic blasts
of gamma rays. Our only hope of surviving them is a
fallback plan. And the bottom line in that plan is food.
⋆ Your post-apocalyptic community will only be able to dine
out on the leftovers of a fallen civilisation for so long.
Soon enough the preserved cans of food on abandoned
supermarket shelves will have been consumed or gone
off. You will need to grow food.
⋆ You will also need to purify water.Ensuring your drinking
water is safe so that you don’t succumb to disease in a
post-apocalyptic world will be crucial.
⋆ Prevent infection. Aside from securing safe water, the
single most important thing you can do to stay alive in a
post-apocalyptic world without antibiotics is to beware of
infections.

13. Will humans move to
another planet?
Astronomers and scientists use what’s
known as the “Goldilocks” principle to
search for a habitable planet. You see, in
order for another planet to support human
life, it has to have just the right
temperature, atmosphere, and orbit
around a star.
.
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14. Another example is Planet Mars which is one of
Earth's closest neighbors. NASA wants to send
astronauts to Mars, perhaps at some point in the
2030s to colonize there.
Elon Musk, The founder of Space Exploration
Technologies Corp. wants to send humans this
decade, saying in an interview that he was
confident a crewed mission could take place in
2026. Many scientists, however, warn of too many
unanswered questions confronting deep-space
travel. Musk has also acknowledged the risks,
saying “it’s tough sledding over there.”
⋆ There are so many variables
involved that it’s nearly
impossible to find the perfect
planet. In recent years,
scientists have discovered a
large amount of exoplanets,
but close to none of them
could actually support human
life. For example, Kepler 10b,
an exoplanet in another solar
system, is close to the size of
Earth, but it’s too close to its
star for human life.
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15. Conclusion
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⋆ Taking care of the world is the duty of every human
being. Our planet is our home and we must do
everything we can to keep it save. Anyway, In the future
i wish people could develop new technologies and if it is
not possible to save the world, they could move to other
planets.

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Thanks!