Soot is also called black carbon. Increasing combustion, which leads to greenhouse gases emissions is the major cause of global warming and climate change. Soot does not accumulate in the atmosphere like CO2(carbon dioxide). Reduction in soot has immediate but not long-term effects on global warming. If we want to stabilise the climate system, we need to focus on greenhouse gases such as CO2. But soot emission is another bigger threat to humans health which makes people live shorter. It is not to say that we should ignore carbon dioxide emissions and other greenhouse gases. It is that soot emission is one quarter more harmful to health than carbon dioxide is. Also, the reduction of soot emission is the quickest and easiest way to tackle global warming in the short-term. Reducing soot emissions provides the quickest and most effective short-term climate and health benefits, but a stable climate requires long-term reductions in greenhouse gases like CO2.