Advances in climate modelling have [ tied global heating to long droughts ]( http://www.theguardian.com/environment/climate-consensus-97-per-cent/2014/sep/02/global-warming-making-weather-more-extreme ) including the current drought in California.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#03_September_2014_%28Global_heating_tied_to_droughts%29