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“Robert A. McCormick, of |ESSA’s Air Resources Laboratory assigned to the Public Health I Service in Cincinnati, and his colleagues have cited some alarming evidence that this has l actually? started to happen,” Mr. j Mitchell says. “Russian meteorologists have arrived at the same conclusion.”
Dust is turning up in ’greater quantities in the atmosphere over such places as Davos, Switzerland, and Mauna Loa Observatory in | Hawaii. Measurements there are! thought to be fairlvl representative of conditions in! the atmosphere at large.
Dust reflects some of the sun’s' heat back into space. The dust also may absorb a small portion j of the sun’s heat, preventing it from traveling farther.
The overall warmine trend from about 1900 to 1950rnoved the crop line 50 to 100 miles north on the Canadian prairies. In parts of northern New England and eastern Canada, warmer, weather killed birch trees andi
The postcard celebrates its | centennial this year, the National j Geographic says. It was! introduced on October 1. 181)9,1 in Austria
Cranium was discovered in 178!) by' a German chemist, Martin Klaproth, but remained an 1 obscure element for more than a century.
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