Sify: Black carbon pollution – soot, diesel exhaust – is a greater contributor to global warming than believed earlier, according to leading atmospheric scientist V. Ramanathan of the Scripps Institution of Oceanography. And China and India are major culprits, together accounting for between 25 and 35 per cent of black carbon emissions. Produced by biomass burning, cooking with solid fuels and diesel exhaust, black carbon has a warming effect three to four times greater than …