imagine the most profound Ice Age you can think of
Ice Age you can think of
Ice Age you can think of temperatures plummet to below zero even
temperatures plummet to below zero even
temperatures plummet to below zero even at the equator before long ice encloses
at the equator before long ice encloses
at the equator before long ice encloses our entire planet research suggests that
our entire planet research suggests that
our entire planet research suggests that this may have happened not once but
this may have happened not once but
this may have happened not once but three times in our planets past
three times in our planets past
three times in our planets past welcome to snowball earth a snowball
welcome to snowball earth a snowball
welcome to snowball earth a snowball earth is certainly the most extreme
earth is certainly the most extreme
earth is certainly the most extreme climate change we can conceive the earth
climate change we can conceive the earth
climate change we can conceive the earth having ever experienced what would
having ever experienced what would
having ever experienced what would happen if the world froze over today
happen if the world froze over today
happen if the world froze over today massive glaciers creep from the poles
massive glaciers creep from the poles
massive glaciers creep from the poles crushing everything in their path first
crushing everything in their path first
crushing everything in their path first of all the Canadians are going to have
of all the Canadians are going to have
of all the Canadians are going to have to dig much deeper holes when they go
to dig much deeper holes when they go
to dig much deeper holes when they go ice fishing next the governors of
ice fishing next the governors of
ice fishing next the governors of Washington Idaho Montana North Dakota
Washington Idaho Montana North Dakota
Washington Idaho Montana North Dakota Minnesota and Michigan and Maine will
Minnesota and Michigan and Maine will
Minnesota and Michigan and Maine will probably declare federal emergencies
probably declare federal emergencies
probably declare federal emergencies cities grind to a halt powerlines
cities grind to a halt powerlines
cities grind to a halt powerlines collapse and water supplies freeze cars
collapse and water supplies freeze cars
collapse and water supplies freeze cars won’t start roads are cut off by ice
won’t start roads are cut off by ice
won’t start roads are cut off by ice building strain and crumble under deep
building strain and crumble under deep
building strain and crumble under deep drifts of snow
drifts of snow
drifts of snow everything is entombed our frail bodies
everything is entombed our frail bodies
everything is entombed our frail bodies struggle to survive I think human
struggle to survive I think human
struggle to survive I think human society would collapse if a snowball
society would collapse if a snowball
society would collapse if a snowball earth happened again the oceans freeze
earth happened again the oceans freeze
earth happened again the oceans freeze over fish die and marine ecosystems
over fish die and marine ecosystems
over fish die and marine ecosystems collapse our food supply becomes
collapse our food supply becomes
collapse our food supply becomes exhausted any surviving humans are
exhausted any surviving humans are
exhausted any surviving humans are trapped in an icy hell we would have a
trapped in an icy hell we would have a
trapped in an icy hell we would have a mass die-off of humans simply because we
mass die-off of humans simply because we
mass die-off of humans simply because we could not grow enough food under these
could not grow enough food under these
could not grow enough food under these conditions
conditions
conditions incredible though it may seem the Earth
incredible though it may seem the Earth
incredible though it may seem the Earth may have frozen over completely
scientists are finding clues in
scientists are finding clues in unexpected places the story begins with
unexpected places the story begins with
unexpected places the story begins with a mystery in the arid Flinders Ranges in
a mystery in the arid Flinders Ranges in
a mystery in the arid Flinders Ranges in southern Australia layers of ancient
southern Australia layers of ancient
southern Australia layers of ancient rock hold unusual stones these stones
rock hold unusual stones these stones
rock hold unusual stones these stones are foreign to the area they are known
are foreign to the area they are known
are foreign to the area they are known as drop stones the drop stones are
as drop stones the drop stones are
as drop stones the drop stones are embedded in an ancient sedimentary sea
embedded in an ancient sedimentary sea
embedded in an ancient sedimentary sea floor that formed around six hundred and
floor that formed around six hundred and
floor that formed around six hundred and fifty million years ago Tim Raab a
fifty million years ago Tim Raab a
fifty million years ago Tim Raab a geologist at the California Institute of
geologist at the California Institute of
geologist at the California Institute of Technology hunts for these drop stones
Technology hunts for these drop stones
Technology hunts for these drop stones at the Flinders range
this is an example to drop stone a piece
this is an example to drop stone a piece of ancient rock that was dropped into
of ancient rock that was dropped into
of ancient rock that was dropped into the ancient mud on the sea bottom these
the ancient mud on the sea bottom these
the ancient mud on the sea bottom these drop stones are visibly different from
drop stones are visibly different from
drop stones are visibly different from the sedimentary bedrock around them
the sedimentary bedrock around them
the sedimentary bedrock around them something powerful must have carried
something powerful must have carried
something powerful must have carried them here but what Dan Schrag professor
them here but what Dan Schrag professor
them here but what Dan Schrag professor of Earth and Planetary Sciences at
of Earth and Planetary Sciences at
of Earth and Planetary Sciences at Harvard University believes the answer
Harvard University believes the answer
Harvard University believes the answer is glaciers he actually have ice cubes
is glaciers he actually have ice cubes
is glaciers he actually have ice cubes here that we’ve made with pieces of sand
here that we’ve made with pieces of sand
here that we’ve made with pieces of sand and gravel in them so this these ice
and gravel in them so this these ice
and gravel in them so this these ice cubes are like the glaciers that are
cubes are like the glaciers that are
cubes are like the glaciers that are taking rocks from the land and then when
taking rocks from the land and then when
taking rocks from the land and then when we put them in the water they’ll
we put them in the water they’ll
we put them in the water they’ll actually melt and the sand and gravel
actually melt and the sand and gravel
actually melt and the sand and gravel will fall to the bottom just like the
will fall to the bottom just like the
will fall to the bottom just like the drop stones on the ocean floor these
drop stones on the ocean floor these
drop stones on the ocean floor these drop stones are evidence that at some
drop stones are evidence that at some
drop stones are evidence that at some point this area was covered in a thick
point this area was covered in a thick
point this area was covered in a thick layer of ice
layer of ice
layer of ice you
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