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Humanity evolved in an Ice Age in which glaciers covered much of the world. But starting about 15,000 years ago, temperatures began to climb. Civilization and all of recorded history occurred in this warm period, the era known as the Holocene-the long summer of the human species... Read Full Overview

For more than a century we've known that much of human evolution occurred in an Ice Age. Starting about 15,000 years ago, temperatures began to rise, the glaciers receded, and sea levels rose. The rise of human civilization and all of recorded history occurred in this warm period,... Read Full Overview

For more than a century we've known that much of human evolution occurred in an Ice Age. Starting about fifteen thousand years ago, temperatures began to rise, the glaciers receded, and sea levels rose. The rise of human civilization and all of recorded history occurred in... Read Full Overview

The Earth's climate has always been in flux: glacial periods and warm ones have slowly and relentlessly alternated for millennia. But the period of global warming of the last 15,000 years is without precedent, and it set the conditions which enabled civilization to arise. It... Read Full Overview

For more than a century we've known that much of human evolution occurred in an Ice Age. Starting about fifteen thousand years ago, temperatures began to rise, the glaciers receded, and sea levels rose. The rise of human civilization and all of recorded history occurred in... Read Full Overview