"The Sustainable Planet Forum is focusing on the issue of sustainable development—how we can provide for our needs without stopping future generations from satisfying needs of their own (and without wrecking the planet)—which until less than a decade ago was the animating cause of the environment movement, until concern for climate change swept everything before it. The forum also has an underlying subsidiary theme, which is Europe and its future. But it was the idea of economic growth, or rather degrowth, to use the term of Mr Ariès—décroissance—which set the debates going with a bang."