Reuters: Economic slowdown will give a respite from surging greenhouse gas emissions but the world will struggle to shift in the long-term to new, greener lifestyles, delegates said at U.N. climate talks on Thursday. Most experts expect the downturn will dent a 3 percent a year rise in world emissions, mainly from burning fossil fuels. But one scientist said a repeat of the Great Depression of the 1930s would mean them falling by 35 percent. “What we’re seeing in a number of countries …