In the beginning of October 2009 a review article on Untangling aerosol effects on clouds and precipitation in a buffered system was published in Nature (Vol 461, Issue 7264 , p. 607) by Bjorn Stevens and Graham Feingold. The paper is linked to the Aerosol, Clouds, Precipitation, Climate (ACPC ) program initiated by iLEAPS, IGAC and GEWEX .