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Due to variations in the Earth's orbital process, the planet has experienced a series of Ice Ages over the past 2.6 million years. The most recent cycle culminated in the Last Glacial Maximum (or LGM) some 18,000 years ago, the world-- especially the northern hemisphere-- was a very different place than it is today. Ice covered large areas-- nearly 32% of the Earth's land area, sea level was about 120 meters lower than it is today, and many large, non-extinct mammals such as mammoths roamed the northern lands.
Climate Timeline Tool: Climate Science for 100,000 Years
Seeded on Thu Feb 9, 2012 3:10 AM EST
Article Source: National Oceanic and Atmospheric Administration- Enjoy this article? Help vote it up the 'Vine.
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Our modern period of global warming began 18,000 years ago.
During ice age events, the bottom of the Persian Gulf is exposed as dry land and the Sahara Desert has regular rainfall. The rainfall over the Sahara is responsible for oases that still provide water.
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