Economist: THE idea that climate change will lead to war is often raised by environmental pessimists, and a meeting on the climatic past of South-East Asia, held last month in Dalat, Vietnam, suggests it is not such an unlikely thought. The meeting was organised by the Lamont-Doherty Earth Observatory, part of Columbia University, some of whose researchers have been trying to reconstruct the pattern of South-East Asia’s monsoons over the past few centuries. One matter they raised was the possibility …