But the rock-bottom fertility rates in the tigers give the problem particular potency.

ECONOMIST: Banyan

Panos Zavos , the Kentucky fertility doctor and would-be human cloner, apparently doesn't see Lucas' clone army as a problem.

FORBES: Scientists Fret Over 'Clones'

Falling fertility has taken much of the urgency out of the debate about population growth, at least among experts, since it seems to be solving the problem of excessive births (a view criticised by Mr May, who points out that even if fertility has declined, the momentum of change means populations will go on rising for a while).

ECONOMIST: The digressions of people power