Sun may affect global warming and cooling
The brightening and dimming of the sun may account for a 1,500-year cycle of cooling and warming on parts of the Earth, a study of ice in the North Atlantic suggests.
Researchers found that a very slight difference in the amount of solar energy reaching the Earth can have a powerful chilling effect on the climate: ice builds up in lands bordering the North Atlantic, the average temperature drops in Europe and North America.
