United Press International: China’s top climate-change negotiator said he was keeping an open mind on whether global warming was man-made or the result of natural cycles. Speaking in New Delhi following the conclusion Sunday of a two-day meeting of ministers from the BASIC group of the most powerful emerging economies — China, India, Brazil and South Africa — Xie Zhenhua said climate change was a “solid fact.” But, he said, more and better scientific research was needed to determine the causes. India …