Climate change crusaders insist that the earth is warming largely due to the emission of greenhouse gases by motor vehicles and factories.
But Thomas Jefferson wrote about global warming back in the early 19th century, before there were any emissions from cars, coal-fired power plants, and other developments of the Industrial Age.
In a letter to Philadelphia physician and professor Nathaniel Chapman dated Dec. 11, 1809, nine months after he left the presidency, Jefferson wrote: “The change which has taken place in our climate is one of those facts which all men of years are sensible of and yet none can prove by regular evidence. They can only appeal to each other’s general observation for the fact.
“I remember that when I was a small boy, say sixty years ago, snows were frequent and deep in every winter, to my knee very often, to my waist sometimes, and that they covere
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