Indo-Asian News Service: Global warming is caused by excess of greenhouse gases, mainly carbon dioxide, but cutting down other pollutants such as soot can help slow climate change in a big way, say the world’s leading scientists, including an Indian American. Nobel laureate Mario Molina of the University of California San Diego (UCSD), Veerabhadran Ramanathan, of Scripps Institution of Oceanography at UCSD and other leading climate scientists said in a new paper that black carbon soot, tropospheric ozone, and …