The Greenhouse Péclet Number: Radiative Opacity as Void Condition and the Thermodynamic Inevitability of Climate Drift

Formally establishes that the greenhouse effect is a void condition: CO₂ increases IR opacity, making the atmosphere opaque to outgoing radiation and driving heat accumulation via drift-dominated transport. Tipping points (ice-albedo feedback, AMOC shutdown, permafrost thaw) are V* crossings — T4 population amplification cascades with a single dimensionless control parameter Pe. The conjugacy theorem shows climate monitoring and climate intervention compete for the same information budget. Constraint cost (T3) explains why stable climate requires continuous energy input from carbon sinks.