When Humans Nearly Vanished: The Catastrophic Explosion of the

When Humans Nearly Vanished: The Catastrophic Explosion of the Toba Volcano

The fascinating true story of the explosion of the Mount Toba supervolcano--the Earth's largest eruption in the past 28 million years--and its lasting impact on Earth and human evolution

Some 73,000 years ago, the huge dome of Mount Toba, in today's Sumatra, Indonesia, began to rumble. A deep vibration shook the entire island. Jets of steam and ash emanated from the summit, followed by an explosion louder than any sound heard by Homo sapiens since our species evolved on Earth. The eruption of the Toba supervolcano released the energy of a million tons of explosives; seven hundred cubic miles of magma spewed outward in an explosion forty times larger than the largest hydrogen bomb and more than a thousand times as powerful as the Krakatau eruption in 1883. So much ash and debris was injected into the stratosphere that it partially blocked the sun's radiation and caused global temperatures to drop by five to nine degrees. It took a full decade for Earth to recover to its pre-eruption temperatures.

When Humans Nearly Vanished presents the controversial argument that the Toba catastrophe nearly wiped out the human race, leaving only about a thousand to ten thousand breeding pairs of humans worldwide. Human genes today show evidence of a "genetic bottleneck," an effect seen when a population of organisms becomes so small that their genetic diversity is greatly reduced. This group of survivors could be the ancestors of all humans alive today. Donald R. Prothero explores the geological and biological evidence supporting the Toba bottleneck theory; reveals how the explosion itself was discovered; and offers insight into how the world changed afterward and what might happen if such an eruption occurred today. Prothero's riveting account of this calamitous supervolcanic explosion is not to be missed.
Country USA
Brand Smithsonian Books
Manufacturer Smithsonian Books
Binding Hardcover
Color Black
ReleaseDate 2018-10-16
UnitCount 1
Format Illustrated
EANs 9781588346353

Country	USA
Brand	Smithsonian Books
Manufacturer	Smithsonian Books
Binding	Hardcover
Color	Black
ReleaseDate	2018-10-16
UnitCount	1
Format	Illustrated
EANs	9781588346353

When Humans Nearly Vanished: The Catastrophic Explosion of the Toba Volcano

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