g2.
For Daisyworld, see Lovelock (1988); Harding (2006), pp 76–85. For the breakdown that follows when a system is stressed beyond the limits of what it can cope with (overshoot), see Donella H. Meadows, Dennis L. Meadows and Jørgen Randers (1992), Beyond the Limits; William Catton (1980), Overshoot; Ervin László (2006), The Chaos Point.