What If All Glaciers Melted, Instantly (Hour by Hour)

Mountains of ice across the planet explode into water. Entire cities and countries, obliterated. The biggest worldwide tsunami in the history of the planet. But where would all this water go? Which places would be lost, and which survive? And how long until humanity would go extinct?

00:00 What If All Glaciers Melted Instantly?
00:42 Mountain Glaciers vs. Ice Sheets
01:25 Scenario 1: All Alpine Glaciers Melt Instantly
02:03 Drying Up the World's Major Rivers
03:47 The Impact on Coastal Sea Levels
05:25 Scenario 2: The Two Great Ice Sheets (Greenland & Antarctica)
07:42 99% of Freshwater Ice & Gravity Shifts
08:24 The 65-Meter (215 ft) Sea Level Rise
09:16 The Deep Ocean Tsunami Physics
10:14 North Pole Tsunami: Hits & Inundation
11:21 South Pole Tsunami: The Antarctic Beast
12:12 Waves Collide: Wiping Out Cities & Countries
13:14 The New Inland Map & Secondary Disasters
15:25 Scenario 3: Melting the Sea Ice (The Cryosphere)
16:36 Why Sea Ice Doesn't Raise Water Levels (Displacement)
17:08 The Albedo Effect & Accelerated Global Warming
18:31 The Climate Feedback Loop & Civilization Collapse
19:40 Can the Glaciers Ever Return? (Hysteresis)
20:42 The New Waterworld Era