Research and the RIBA. Lea's Pottery: Ignoring environmental issues

There is a strange perversity about the way in which Dean Hawkes writes so eloquently about David Lea's work (arq6/2, pp130–143) without mentioning sustainability or environmental issues. No doubt he will argue that they are implicit in Lea's programme. However this is essentially the problem in that without making them explicit, many people will not understand them. Hawkes is an authority on environmental architecture so why is he so assiduous in avoiding such issues in this piece?