Transport and its infrastructure - IPCC. EN. ... as was the case for IPCC (1999). Forster et al. (2007) assumed that aviation radiative forcing (0.048 W/m 2 in 2000, which excludes cirrus) to have grown by no more that 10%. between 2000 and 2005. Forster et al. (2007) estimate a total net anthropogenic radiative forcing in 2005 of 1.6 W/m 2 (range