Topic: Jim Butler
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Antarctic Ozone Hole 2nd Smallest in 20 Years
On the Earth's surface, ozone is a pollutant, but in the stratosphere, it reflects ultraviolet radiation back into space, protecting us from skin cancer-causing UV rays.
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Climate change: Arctic passes 400 parts per million milestone
Arctic monitoring stations show carbon dioxide levels are now above 400 parts per million. Carbon dioxide is the chief climate-change gas and stays in the atmosphere for 100 years. Before the Industrial Age, carbon dioxide levels were 275 ppm.







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