  In our comments we explicitly acknowledge the attempt of Hansen et al. to
assess various uncertainties inherent in geophysical data being based on
different measuring concepts and observation methods. However, with regard to
the planetary energy budget, this paper offers some vulnerable points. We will
focus our comments on these vulnerable points only. We will show that the
energy imbalance of the entire Earth-atmosphere system is, indeed, based on
these inherent uncertainties. We will demonstrate that the accuracy in the
quantification of the global energy flux budget as claimed by Hansen et al. is,
by far, not achievable in case of the entire Earth-atmosphere system. Using the
value of the solar constant of S_0 = 1361 W/m^2 recently determined on the
basis of total-solar-irradiance (TSI) observation by three different satellite
projects (ACRIMSAT/ACRIM3 launched in 2000, SORCE/TIM launched in 2003, and
PICARD/PREMOS launched in 2010) we will document that the planetary energy
imbalance of F = 0.58 +/- 0.15 W/m^2 calculated by Hansen et al. does not
exist. Consequently, the implications related to this planetary energy
imbalance have no basis.
