Study: High Earth Temperatures Manmade, Not Natural
The National Academy of Sciences, reviewing a broad swath of scientific studies, concludes that the presently high temperature of the Earth is due to human action, not cyclical natural temperature spikes.
The National Academy of Sciences, reviewing a broad swath of scientific studies, concludes that the presently high temperature of the Earth is due to human action, not cyclical natural temperature spikes.
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The Earth is the hottest it has been in at least 400 years, probably even longer. The National Academy of Sciences, reaching that conclusion in a broad review of scientific work requested by Congress, reported Thursday that the “recent warmth is unprecedented for at least the last 400 years and potentially the last several millennia.”
A panel of top climate scientists told lawmakers that the Earth is heating up and that “human activities are responsible for much of the recent warming.” Their 155-page report said average global surface temperatures in the Northern Hemisphere rose about 1 degree during the 20th century.
This is shown in boreholes, retreating glaciers and other evidence found in nature, said Gerald North, a geosciences professor at Texas A&M University who chaired the academy’s panel.
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As human growth adds to our numbers and demands, other species’ survival chances shrink.
The spread of the human horde means under a quarter of the world’s habitable land now counts as wilderness.
Some scientists speculate that civilizations destroy the conditions for their own survival. If they are right, an enduring silence may be the real message from other parts of the universe.
The mass of all the people on the planet is more or less 10 times the mass of all living wild mammals.
Astrobiology—the search for alien life—suggests a lesson for us here on earth: Civilization may not be sustainable over geological eras but, rather, self-destroying.
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