Two adjacent headlines from the Reuters Health eLine appear to support the Gaia hypothesis. This suggests that the Earth behaves like a giant organisim and reacts to threat levels in ways that try to restore a balanced state to the planet. Today I see a) Goal of eliminating malaria in sight: experts and b)Deadly flu breaks out in Mexico, U.S.
Gaia seems to be substituting one threat for a new more virulent threat which will kill countless numbers of people before we get a handle on it and eradicate it.
It is just possible that, unless we find some way to control our propensity for limitless breeding, the poor old Earth will find ways to do it for us. We can but hope.