Study: Oxygen Levels Have Varied Little Over Ages
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Extreme Heat A Threat To World's Poor
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New Reports Says Military Ignoring Brain Research
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Maryland Residents Asked To Cut Energy Use
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Vermont's Unique Approach To Curbing Energy Use
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Energy Conservation: Starting At Home
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Study: Parasites Sometimes Essential
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Hopes For Climate Solutions Dim At G-8 Summit
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Madagascar Chameleon's Short, Vibrant Life
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U.S. on Pace for Record Tornado Season
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Trees Do Their Best Work with Thermostats at 70
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NASA Downplayed Climate Studies, Monitor Says
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Astronomers Capture Star Exploding
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Low-Oxygen Zones Spreading to Deep Ocean
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