Al Jazeera: The United States and other rich nations are doing less than their fair share to fight climate change under a U.N. accord due in December, while China is outperforming, a report by 18 civil society groups said on Monday. Overall, governments' pledges for curbs on greenhouse gas emissions are not enough to limit a rise in temperatures to 2 degrees Celsius (3.6 Fahrenheit), seen as a threshold for damaging heat waves, downpours and rising sea levels, it said. "The ambition of all major developed...