As this information sheet describes some pretty basic facts about greenhouse gases and aerosols, it is difficult for it to stray too far from reality. When speaking about water vapor, however, it only describes its positive feedbacks on earth's climate system, via its role as a greenhouse gas. Unmentioned is the fact that a warming-induced increase in global water vapor content can also produce a negative feedback by creating more clouds of a more highly-reflective nature (Paltridge, 1980; Charlock 1981, 1982; Somerville and Remer, 1984; Roeckner et al., 1987). Also, the material on methane is somewhat out of date, as it does not mention that its rate of growth in the atmosphere has slowed dramatically in recent years (Dlugokencky et al., 1998), so much so, in fact, that its atmospheric concentration may soon stabilize. Finally, the statement that "humanity's greenhouse gas emissions have already disturbed the global energy budget by about 2.5 watts per square meter" implies that this disturbance has been measured, when in reality it has only been calculated. Furthermore, this calculation does not include all of the many feedback and concurrent non-feedback (but related) phenomena that can impact the final result.
References
Charlock, T.P. 1981. Cloud optics as a possible stabilizing factor in climate change. Journal of the Atmospheric Sciences 38: 661-663.
Charlock, T.P. 1982. Cloud optical feedback and climate stability in a radiative-convective model. Tellus 34: 245-254.
Dlugokencky, E.J., Masarie, K.A., Lang, P.M. and Tans, P.P. 1998. Continuing decline in the growth rate of the atmospheric methane burden. Nature 393: 447-450.
Paltridge, G.W. 1980. Cloud-radiation feedback to climate. Quarterly Journal of the Royal Meteorological Society 106: 895-899.
Roeckner, E., Schlese, U., Biercamp, J. and Loewe, P. 1987. Cloud optical depth feedbacks and climate modeling. Nature 329: 138-140.
Somerville, R.C.J. and Remer, L.A. 1984. Cloud optical thickness feedbacks in the CO2 climate problem. Journal of Geophysical Research 89: 9668-9672.