Global warming not linked to sun

Cyclical changes in the sun's energy output are not responsible for Earth's recent warming, a new study asserts.
The findings put the blame for climate change squarely on human-created carbon dioxide and other greenhouse gases, reinforcing the beliefs of most climate scientists.
The sun's output waxes and wanes due to a variety of mechanisms. Its power rose during much of the 20th century, but it has declined. “Up until 1985, you could argue that the sun was (trending) in a direction that could have contributed to Earth's rising temperatures,” said study author A. Mike Lockwood of the University of Southampton in Britain.
Two decades ago, “it did a U-turn. If the sun had been warming the Earth, that should have come to an end, and we should have seen temperatures start to go the other way,” Lockwood said.
Yet temperatures have continued to climb since that date, making a strong solar role in warming appear unlikely.
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Global Warring: Climate Change Could Be The Root Of Armed Conflicts
Source - www.sciencedaily.com Tuesday, July 10, 2007
Climate change, and the resulting shortage of ecological resources, could be to blame for armed conflicts in the future, according to David Zhang from the University of Hong Kong and colleagues. Their research, which highlights how temperature fluctuations and reduced agricultural production explain warfare frequency in eastern China in the past, has been published online in Springer’s journal Human Ecology.
Zhang and his team looked at the impact of climate change on warfare frequency over the last millennium in eastern China. The agricultural production in the region supports the majority of the Chinese population. The authors reviewed warfare data from 899 wars in eastern China between 1000 and 1911, documented in the Tabulation of Wars in Ancient China. They cross-referenced these data with Northern Hemispheric climate series temperature data for the same period.
They found that warfare frequency in eastern China, and the southern part in particular, significantly correlated with temperature oscillations. Almost all peaks of warfare and dynastic changes coincided with cold phases.
Temperature fluctuations directly impact agriculture and horticulture and, in societies with limited technology such as pre-industrial China, cooling temperatures hugely impact the availability of crops and herds. In times of such ecological stress, warfare could be the ultimate means of redistributing resources, according to Zhang and his team.
The authors conclude that "it was the oscillations of agricultural production brought by long-term climate change that drove China’s historical war-peace cycles." They recommend that researchers consider climate change part of the equation when they consider the reasons behind wars in our history.
Looking to the future and applying their findings, Zhang and colleagues suggest that shortages of essential resources, such as fresh water, agricultural land, energy sources and minerals may trigger more armed conflicts among human societies.