The dominant spatially inhomogeneous forcing is that from aerosols, but ozone and, to a minor extent, land - use change also contribute. (climateaudit.org)
Furthermore, they bring up well - established knowledge about the dangers associated with statistics and analysis, such as trend analysis of inhomogeneous data series. (realclimate.org)
Subsequent to AR5, another NASA GISS scientist, Drew Shindell, published a study (Shindell 2014)[28] claiming that the transient response to spatially inhomogeneous forcings was significantly greater than that to GHGs, with the consequence that estimates of TCR based on comparing GMST and total forcing changes since circa 1850 were biased down. (climateaudit.org)