:00:13
Earth, 18,000 years
before the present
:00:25
it's a world locked in cold
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at the height
of the last great lce Age.
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Across tens
of thousands of years
:00:39
unmelting snows have compacted
into massive glaciers.
:00:44
Buried under ice sheets
averaging a mile thick
:00:48
are lands where
hundreds of millions live today.
:00:56
As Earth's water
is increasing locked up in ice
:01:00
sea levels plummet
more than a hundred meters.
:01:04
Exposed sea floor nearly joins
Australia to Southeast Asia
:01:16
Japan becomes part
of mainland Asia.
:01:37
Across North America,
ice fields and glaciers
:01:40
envelop all of Canada
and northernmost United States.
:01:50
As the lce Age spreads,
Alaska emerges as a crossroads.
:01:59
Off it's Bering sea coastline