Reuters: Air pollution, dust and other tiny particles that can bounce sunlight back into space are braking global warming less than previously believed, a Norwegian study said. The report, which helps understand how climate change works, said scientific estimates of light-reflecting airborne particles had underestimated a fast build-up of black airborne soot, which has the opposite effect by soaking up heat. “The black carbon, or soot, emissions have increased fastest,” said Gunnar …