The pollution that humans create is leading the thunderstorms clouds to capture heat, increasing global warming in a way that climate models have not taken into account.  Jiwen Fan of the Department of Energy's Pacific Northwest National Laboratory says that it causes their anvil shaped tops to spread out high in the atmosphere and capture hear, especially more at night.  Previous work has show us that when it is not too windy, pollution leads into bigger clouds.  This happens because the more pollution particles divide up the available water for droplets, it leads to a higher number of smaller droplets that are too small to rain.  Then they ride higher, where they are frozen and absorb more water vapor.

 

http://www.tgdaily.com/sustainability-features/63506-pollution-in-thunderclouds-increases-global-warming