Good point. But this was 50 years to adapt chemically - in order to merely survive.
It would surely take much longer to adapt in such a way as to actually derive excess energy from D2O, and almost all experts in biology would say it is impossible. Kervan is controversial and there is evidence both ways. He has been replicated by several, and vociferously belittled by others, but his results cannot be written off automatically. Surely, if biology can adapt to transmute one atom into another, then deriving energy from deuterium would be equally feasible . actually easier, given the ease with which the Oppenheimer-Philips reaction (neutron stripping) happens. I wonder if the Russians will share their findings . From: Jed Rothwell Celani et al. already found species adapted to heavy water: Ralstonia detusculanense. http://www.uniprot.org/taxonomy/148618 And one other. See the papers at LENR-CANR.org. This stuff in the heavy water from Ontario Hydro (which I think has a new name). It adapted sometime in the last 50 years. Evolution works faster than you might think. - Jed