"It used to be the biggest question, but now it seems to be the forgotten question of the environment movement: can economic growth continue indefinitely? And this weekend it's going to be brought back into the spotlight at a major international gathering co-sponsored by The Independent. For three days from today, politicians, environmentalists, writers and thinkers from Britain, France and Italy will gather in the French city of Lyon to debate the idea of 'A Sustainable Planet'. Sustainability: that's the forgotten issue which until a decade ago was the green movement's major concern. Can we provide for our needs now, in the present generation, without ruining the prospects of the generations of the future?"