[Paradox]

Sunspot cycles may hold key to global warming, cooling

Past cool periods, identified with the late stages of the "Little Ice Age" and with the Maunder and Dalton climate minima, closely correlate with low sunspot numbers (astronomers have kept close tabs on sunspots since Galileo's time). Some solar-physicists are now saying if the current cycle doesn't begin to produce spots soon, we can expect a cool-down like the 19th-Century Dalton minimum - or worse. Decades-long cooling in the past brought crop failures to Europe from repeated summer frosts and restricted growing seasons.