  We find that recent results from the KamLAND collaboration on geologically
produced antineutrinos, N(U+Th) = 28+16-15 events, correspond to a radiogenic
heat production from Uranium and Thorium decay chains H(U+Th) = 38+35-33 TW.
The 99% confidence limit on the geo-neutrino signal translates into the upper
bound H(U+Th) < 162 TW, which is much weaker than that claimed by KamLAND,
H(U+Th) < 60 TW, based on a too narrow class of geological models. We also
performed an analysis of KamLAND data including recent high precision
measurements of the C13(\alpha,n)O16 cross section. The result, N(U+Th) =
31+14-13, corroborates the evidence (approx 2.5\sigma) for geo-neutrinos in
KamLAND data.
