Building an eco-economy / Lester Brown -- World population and the environment / Herve Le Bras -- Urban landscapes, landscapes of urbanism / Jean-Robert Pitte -- Farmers of the world: the price of our future / Laurence Roudart and Marcel Mazoyer -- Water: humanity's heritage / Marie-France Dupuis-Tate and Bernard Fischesser -- Biodiversity: a question of survival / Jean-Marie Pelt -- A plea for the seas / Christian Bucher -- Changing climates / Anne Juillet-Leclerc -- Renewable energy / Reiner Klingholz -- Toward a sustainable development / Christian Brodhag -- What do we do? / Edward Goldsmith -- The earth in numbers / Maximilien Rouer story of a book / Anne Jankeliowitch.