2011-11-01 The limits to growth – Donella Meadows, Dennis Meadows, Jørgen Randers and Behrens William W. III – 1972 Societies
2012-06-01 Doing one’s good deed regarding climate change : what is the impact of individual actions? Acting individually
2002-10-27 A letter published in the reader’s section of “Le Monde” about Jeremy Rifkin and hydrogen Newspaper articles