The authors make a surprising projection of a much greener planet in the future, based on long range anaylsis of trends in the efficient use of energy, materials and land. It is an optimistic book which argues that we should be able to produce a far superior industrial ecology. For example, they project we could significantly increase land areas reserved for nature by conducting highly productive and environmentally friendly agriculture on less land than we use today, even as population levels increase. A fascinating book, rich in theory and data.