字幕表 動画を再生する
-
With devastating hurricanes, refugee crisis
-
and the real possibility of nuclear war. It can sometimes
-
feel like the end is near. But what are the biggest threats
-
to humanity and is there anything we can do to stop them?
-
Experts all over the world from the Global Challenges Foundation
-
in Stockholm and the Centre for the Study of Existential Risk
-
at the University of Cambridge consider this question yearly
-
using scientific research. Some risks lay
-
millions of years into the future like gamma-ray burst
-
caused by a star explosion which would destroy our
-
ozone layer or even the over expansion or
-
collapse of the entire universe. Closer to home
-
we have our sun which will eventually become a red giant as it ages
-
and engulf the entire planet
-
but even that isn't for another 5 billion years.
-
More imminent is an asteroid large enough to
-
create a global catastrophe which is estimated to occur
-
every 120,000 years. While none are currently
-
expected to hit earth soon existing data is incomplete
-
with a worldwide effort underway to
-
to search the skies. Should it happen
-
it could create a global cooling event like the ice age.
-
But even smaller asteroids could have a significant impact
-
on both natural and human ecosystems too.
-
An even closer possibility is the super volcano
-
the devastation in Pompeii from Mount Vesuvius released around
-
4 km cubic of magma but the super volcanos
-
can release more than 500 km cubic.
-
The real worry from this worldwide is
-
the ash cloud which would block out the sunlight, cooling the globe
-
and crippling agriculture. The last known eruption occurred
-
around 25.000 years ago in New Zealand and
-
researchers predict they occur every 30.000 to 50.000 years.
-
Scientists are currently monitoring Yellowstone
-
in the US as a future potential site. But not
-
all of our threats are natural. Overpopulation can
-
outstrip Earth's capacity to produce food
-
and other resources. And amplify the threat of infectious
-
pandemics due to high densities. Perhaps with bioengineered
-
diseases. Conversely evidence is
-
already pointing to declining fertility rates.
-
Will we see the human population gradually die off
-
from lack of births? Or will climate change beat this concern?
-
A rise of 3 degrees Celsius would be incredibly
-
significant with most of Florida and Bangladesh underwater.
-
While several coastal cities would become swamped.
-
On top of this longer and more damaging wild fire seasons,
-
more destructive hurricanes, heat waves, food insecurity
-
and drought. All of which can impact and amplify
-
incidents of violence with. Nations already suffering
-
from water and climate conditions which ultimately
-
impacted deteriorating economic conditions.
-
Then, there is nuclear war. Tensions over North Korea have brought this conflict to the forefront.
-
With over 7000 known warheads between Russia and the US.
-
And nukes within the UK, France
-
China, India, Pakistan, Israel and North Korea.
-
The doomsday clock created by the
-
Bulletin of Atomic Scientists represents the likeliness of a
-
man-made global catastrophe. Though the clock more recently
-
included climate change and some other developments that
-
put humanity at risk emphasis is placed on nuclear war.
-
Since its creation in 1947, the furthest
-
we've been from midnight or doomsday is in 1991
-
when the clock was 17 minutes to midnight.
-
Today in 2017 the clock sits
-
at 2.5 minutes to midnight. The second closest it has ever been.
-
Even a small nuclear war
-
could create a nuclear winter which would cause global cooling
-
and damage to the ozone layer that may ultimately
-
create droughts that lasts more than a decade.
-
But the greatest threat of all: Researches currently believe
-
it's artificial intelligence. If growth continues to
-
become comparable to the industrial and agricultural revolutions
-
Experts predict autonomous machines will attain
-
near human level intelligence by 2075.
-
And even if these machines don't become malevolent or evil
-
what happens if those programmed to kill fall into the
-
wrong hands? Or when AI programmed to do something good
-
go about it with a destructive method?
-
Thank you all so much for watching this video! If you liked it
-
make sure that you subscribe so that you can see our videos that come out every Thursday.
-
And we're gonna like some other videos over there that are similar to this one.
-
About how rich people are prepping for the apocalypse and
-
how to survive a nuclear war. This year is almost over. Hang in there!
-
Peace guys!