Throughout most of the 20th century some scientists, including the highly esteemed astronomer, Percival Lowell, were convinced there were canals on Mars. This delusion went so far that they published detailed maps in scientific journals. In 1969, photos taken by the Mariner spacecraft showed there were no canals.

Scientists can get it wrong.

A few months before the Mars photos arrived, The Observer in London published the first mainstream article about the Greenhouse Effect. Some scientists - and journalists and politicians - took up this doomsday prophecy with gusto.

The sky has been falling ever since.

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