Many of us are blissfully unaware that almost the whole of human history -from the hunters and gatherers to the rise of towns and cities, the development of science and medicine -the whole of our great human pageant- has taken place within an atypical period of fair weather.
For most of our 4.5-billion year history, the typical pattern was for the earth to be hot, sans ice anywhere. The current ice epoch started about 40 million years ago, with at least 17 serious glacial episodes in the last 2.5 million years, which coincides with the rise of homo sapiens, the rise of the Himalayas and the formation of the Isthmus of Panama, disrupting the flows of warming currents between the Atlantic and Pacific.
At the recent American Association for the Advancement of Science Conference, climatologists described an “intensification of droughts, heatwaves, floods, wildfires and severe storms” as “early warning signs of yet more devastating damage to come”. In Great Britain, Stephen Hawking and the Government’s chief scientist, Professor Sir David King, said that climate change that it posed a greater threat than , in tune with other experts who describe global warming as a “weapon of mass destruction.”
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