Fast action to reduce SLCPs has the potential to slow global temperature rise by up to ~0.6°C by 2050, prevent 2.4 million air pollution-related deaths per year, and avoid around 30 million tonnes of crop losses annually. Reductions of SLCPs are complementary to reductions of carbon dioxide emissions and can often be achieved simultaneously. If large-scale reductions of both SLCPs and carbon dioxide are undertaken immediately, there is a high probability of keeping the increase in global temperature to less than 1.5°C above the pre-industrial temperature for the next 30 years and below the 2°C guardrail for the next 60 to 90 years. In addition to slowing the rate of global warming, reducing emissions of SLCPs is particularly beneficial for some of the most vulnerable and threatened regions on the planet, including the Arctic and the Himalayan-Tibetan Plateau, which are warming at more than twice the global average rate. Addressing pollutants such as black carbon, which has especially powerful warming effects in regions of ice and snow, may be the most effective means of slowing and delaying imminent climate impacts in those regions in the near term. To scale up action on SLCPs is crucial to achieve the WB mission.