Global warming may proceed faster and be more severe than previously predicted according to research about to be published in the scientific journal Nature. Reductions in airborne particle pollution, or aerosols, as air quality is improved, will amplify climate change by reducing the cooling effect due to aerosols and also by increasing the amount of carbon dioxide that remains in the atmosphere. Uncertainty about the magnitude of past and present cooling, however, means that we cannot be certain about the strength of future warming, which may exceed previous estimates.