New satellite data shows that tiny airborne particles are changing rainfall patterns around the world. These man-made particles, mostly from burning fossil fuels, make it more difficult for clouds to form and less likely to rain if they do form.
Daniel Rosenfeld of the Hebrew University of Jerusalem says that because they block sunlight, these tiny particles slow down the evaporation from lakes and oceans ?so they suppress clouds in the first place.? The particles are too small to form the seeds of raindrops, the way dust usually does, ?so the clouds that do form?have a hard time [producing] rain.?