Equilibrium global temperature and CO₂ partial pressure for an Earth-like planet as a function of time with land-based and seafloor weathering, with W_L0 = W_S0 = 1/3. The outgassing rate decays exponentially with an initial value G₀ = 5 times the current rate. The green curves show a case with weathering CO₂-pressure dependences β_L = β_S = 0.1. The purple curves show the case with β_L = β_S = 0.5.