 Satellite imagery often shows trails of cloud or of enhanced brightness of cloud behind ocean-going ships due to this effect.The decrease in global mean absorption of solar radiation due to increases in CCN concentrations exerts a cooling influence on climate; the global average magnitude of this effect over the industrial era is estimated as between -0.3 and -1.8 Wm−2.Assume a uniform cloud that extends infinitely in the horizontal plane, also assume that the particle size distribution peaks near an average value of formula_1.