Smil, Vaclav Global ecology : environmental change and social flexibility / Vaclav Smil - London : Routledge, c1993. - xiii, 240 p. ; ill., maps. ; 24 cm. ISBN: 0415098866 LCCN: Subjects--Topical Terms: Environmental policySustainable development LC Class. No.: GE170 / .S65 1993