A Russian scientist predicts a period of global cooling in coming decades, followed by a warmer interval.
Khabibullo Abdusamatov expects a repeat of the period known as the Little Ice Age. During the 16th century, the Baltic Sea froze so hard that hotels were built on the ice for people crossing the sea in coaches.
The Little Ice Age is believed to have contributed to the end of the Norse colony in Greenland, which was founded during an interval of much warmer weather.
Abdusamatov and his colleagues at the Russian Academy of Sciences astronomical observatory said the prediction is based on measurement of solar emissions, Novosti reported. They expect the cooling to begin within a few years and to reach its peak between 2055 and 2060.
"The Kyoto initiatives to save the planet from the greenhouse effect should be put off until better times," he said. "The global temperature maximum has been reached on Earth, and Earth's global temperature will decline to a climatic minimum even without the Kyoto protocol."