2.
Criticism of growth arose with the discovery that growth beyond a certain point is destructive of the earth. We are already using resources much faster than they can be replenished. We are producing wastes much faster than nature's sinks can process them. The growth economy will end. The only questions are when its end will come, and whether humanity will be able to survive its demise.
John B. Cobb
3.
... placing economic activity in the context of the whole earth requires attention to the question of scale. Bigger is obviously not better, so the optimum scale of human economy in relation to the total economy becomes basically a question of sustainability. When the effects of the economy on the environment undercut the possibility of its own continuance, the scale is too large.
John B. Cobb