  We investigate the effects of correlated global regulation mechanisms,
especially Galactic gamma-ray bursts (GRBs), on the temporal distribution of
hypothetical inhabited planets, using simple Monte Carlo numerical experiments.
Starting with recently obtained models of planetary ages in the Galactic
Habitable Zone (GHZ), we obtain that the times required for biological
evolution on habitable planets of the Milky Way are highly correlated. These
results run contrary to the famous anti-SETI anthropic argument of Carter, and
give tentative support to the ongoing and future SETI observation projects.
