The exact amount of this temperature increase, however, remains uncertain because of unpredictable changes in other atmospheric components, especially cloud cover. (britannica.com)
That the forcings are wrong have been shown by both Sylvie Gravel (Canadian operational global NWP model) and Dave Williamson (NCAR atmospheric component of NCAR climate model). (climateaudit.org)
Yet these particles, called secondary organic aerosols, are a dominant atmospheric component in most megacity locations. (pnnl.gov)