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whatif

iceage

00:00:05

earth has gone through at least five

00:00:08

major ice ages in its history

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and you better start adapting now

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because another ice age is about to

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begin

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hypothetically

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how would a new ice age change earth as

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we know it

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what could you do to survive on a frozen

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planet

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and how are we already delaying another

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ice age

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this is what if and here's what would

00:00:39

happen if we entered a new ice age

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during all ice ages in earth's history

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global temperatures dropped well below

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freezing across the planet

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and it wasn't just a few icy trips

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around the sun earth can take hundreds

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of millions of years to thaw out

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the most recent ice age started the

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quaternary period around 2.6 million

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years ago and technically we're still in

00:01:10

it today

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ice ages have the power to radically

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change our planet

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they reshape landscapes they create new

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lakes and rivers

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plants and animals cling to life either

00:01:24

adapting or facing extinction

00:01:27

so

00:01:28

if a new ice age began today

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how soon would our civilization collapse

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into chile chaos

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our sixth major ice age would be a few

00:01:40

thousand years in the making

00:01:42

and it would begin with earth's tilt on

00:01:44

its axis going through its cycle of

00:01:47

changes

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an unstable tilt plus a little wobble in

00:01:52

our orbit around the sun and there would

00:01:54

be less and less solar radiation

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reaching the planet

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you'd see the first effects of this on

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the northern hemisphere

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each year the once lovely summer

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temperatures would start to drop

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eventually they'd fail to rise above

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freezing

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and that's when the snowfall would begin

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to build up

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over time that snow would compress into

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ice sheets

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these glaciers would start in places

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like the northernmost regions of canada

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scandinavia and russia and they would

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spread from there

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the ice would mostly form on dry land

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that's because the waters surrounding

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the ice would create a barrier

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preventing it from expanding as easily

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today about 10 percent of earth's land

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surface is covered by ice

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as our new ice age progresses you could

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see that go up to about 25 percent

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ice would cover eurasia from the british

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isles to siberia

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himalayan ice sheets would expand

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through asia and while the southern

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hemisphere wouldn't be as icy an ice

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sheet would run from the southern tip of

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patagonia well into the andes mountains

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but ice wouldn't be the only change

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sea levels could drop around 120 meters

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lower than they are right now

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this could close off the mediterranean

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sea to the atlantic ocean

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without anywhere else to go

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rainfall and glacial melting would feed

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bodies of water in regions that aren't

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frozen over

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some rivers would also change their

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usual runoffs and form new lakes

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with all these changes in sea levels

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around the world

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land bridges would re-emerge

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russia would now be connected to alaska

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and the islands of indonesia would

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connect to mainland southeast asia

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the borders would change and bring many

00:03:58

countries closer together

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or it would result in whole new

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countries being formed opening up new

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land for you to migrate to

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and you'd need to

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regions that you and hundreds of

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millions of other people used to call

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home would be

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essentially uninhabitable

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surviving the cold would mean moving

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away from the iciest parts of north

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america and eurasia

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but the rest of the world wouldn't be

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too welcoming either

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it would get really dry

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deserts and tundras would expand so the

00:04:35

remaining tropical forests near the

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equator would be refuge for much of the

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planet's plant and animal life

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but what about us

00:04:46

well during the most recent ice age we

00:04:48

actually developed as a species

00:04:51

the land bridges allowed us to spread

00:04:53

out across the globe and the climate

00:04:56

forced us to adapt with new tools and

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clothing

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and as earth rewarmed we started farming

00:05:03

it's likely that we wouldn't fare as

00:05:06

well with a new ice age

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not right away at least

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almost all of our agricultural land

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would be lost

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so intense overcrowding in hospitable

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regions would create chaos and unrest

00:05:21

you should get ready for extreme

00:05:24

competition for life's basic necessities

00:05:29

but i do have good news to ease your

00:05:31

worries about this frigid doomsday

00:05:33

scenario

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come on

00:05:38

sort of

00:05:40

based on current climate science and the

00:05:42

amount of carbon dioxide in our

00:05:44

atmosphere we may have postponed the

00:05:47

next possible ice age by about half a

00:05:50

million years

00:05:52

and if we keep pumping out greenhouse

00:05:55

gases

00:05:56

it's possible that we've not only

00:05:58

postponed it but we've made it

00:06:00

impossible

00:06:02

that just means we'll all

00:06:04

overheat which i guess is better than

00:06:07

being frozen

00:06:10

so earth freezing over may not need to

00:06:12

be high on your worry list but

00:06:15

maybe all the world's ice melting should

00:06:20

well

00:06:21

that's a story

00:06:23

for another

00:06:24

what if

00:06:25

[Music]

Description:

Earth has gone through at least five major ice ages in its history. And you better start adapting now. Because another ice age is about to begin. Hypothetically. How would a new ice age change Earth as we know it? What could you do to survive on a frozen planet? And how are we already delaying another ice age? Transcript and sources: https://whatifshow.com/what-if-we-entered-a-new-ice-age/ Questions or concerns? Contact us at https://underknown.com//contact/ Get our 100 best episodes in one mind-blowing book: https://shop.whatifshow.com/products/what-if-top-100-book?_pos=1&_sid=c5b671f1b&_ss=r%3Futm_source%3Dyoutube Join this channel to get access to perks: https://www.youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/join Check out our other channels: How to Survive: https://www.youtube.com/channel/UCOch_vMp7AKaiGE7e6kSHfg?sub_confirmation=1 Aperture: https://www.youtube.com/c/ApertureScience Crazy Creatures: https://www.youtube.com/channel/UCvD6IcobriqC89sVphFJV3w?sub_confirmation=1 Your Body On: https://www.youtube.com/channel/UC2nLX75iIhJ9ajmVG8lTdHw?sub_confirmation=1 Origins of Food: https://www.youtube.com/c/OriginsofFood Versus: https://www.youtube.com/channel/UCDjdqErCKFtO6Y2pd2fBB7g WTF Did I Just Watch: https://www.youtube.com/channel/UCcWBTKrbwC2Rf-w3yWsKClQ Watch more what-if scenarios: Planet Earth: https://www.youtube.com/watch?v=_-HhCwYD7rc&list=PLZdXRHYAVxTJCzxwmCq0NNpYq9N9wyb2l The Cosmos: https://www.youtube.com/watch?v=gfuJyVkMH_g&list=PLZdXRHYAVxTJno6oFF9nLGuwXNGYHmE8U Technology: https://www.youtube.com/watch?v=CS3bBO05fpU&list=PLZdXRHYAVxTIeRY3JtgXgoGqSEB7kDdKO Your Body: https://www.youtube.com/watch?v=QmXR46TrbA8&list=PLZdXRHYAVxTJNsV9FFeNAKl2ySsHj8GZO Humanity: https://www.youtube.com/watch?v=fdCDQIyXGnw&list=PLZdXRHYAVxTIFnvmOeWbv-Mt8zFxSCSvZ T-shirts and merch: https://whatif.creator-spring.com/ Suggest an episode: https://docs.google.com/forms/d/e/1FAIpQLSfJIU3JxZQvCAJCCFbLQ74gY2qABW6wLj18dOqP-EBujyLrfA/viewform?usp=sf_link Newsletter: https://whatifshow.com/explorers-club/ What If elsewhere: Instagram: https://www.facebook.com/unsupportedbrowser Discord: https://discord.com/invite/WzkQPB3nea Twitter: http://bit.ly/whatif-twitter Facebook: https://www.facebook.com/unsupportedbrowser What If in Spanish: https://www.youtube.com/channel/UC5BW1w7JyJW3r8rpR3BhqKA What If in Mandarin: https://www.youtube.com/channel/UCIG_f_x7GlHsLy18rkDUNrg Podcast: https://whatifshow.com/podcast/ What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure through time, space and chance while we (hopefully) boil down complex subjects in a fun and entertaining way. Produced with love by Underknown in Toronto: https://underknown.com Contact us at https://underknown.com/contact/

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