WASHINGTON (AP) - You can't say we haven't been warned. The upcoming climate summit in Paris is just the latest chapter in the surprisingly long history of grappling with global warming, a history that began with the discovery of the greenhouse effect in the 19th century - before the telephone, the radio or Al Gore. And the first government warning that the world was warming came exactly a half century ago. On Nov. 5, 1965, President Lyndon B. Johnson's science advisory committee told him that "Man is unwittingly conducting a vast geophysical experiment," and that by the year 2000, carbon dioxide levels would increase enough to "almost certainly cause significant changes in the temperature...
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