Presentation Studium Generale Rijksuniversiteit Groningen. Moderne aardappeleters? Kritische consument eet duurzaam voedsel. March 26 2007, Academiegebouw Groningen.
Television program. Adams Appel, TV noord. March 2007.
Presentation Studium Generale TU Delft. Kritisch consumentisme. December 3 2007. Cultureel Centrum Delft.
Keynote presentation First World Water Sustainability-Renewable Energy Congress, November 25-28 2007, Maastricht, the Netherlands The water footprint of energy consumption: an assessment of water requirements of primary energy carriers.
Keynote presentation Gordon research conference of Industrial Ecology, August 17-22 2008, New London, New Hampshire, US. Globalization of water.
Keynote presentation Water and Business Summit 2008, 26-27 November, London, UK, organized by the Ethical Corporation. The water footprint of business.
Participation COST Exploratory Workshop. The Energy-Water Nexus: Managing the Links between Energy and Water for a Sustainable Future, 19-21 January 2009 in Brussels.
Keynote presentation HENVIScience Day, April 16 2009. Helsinki University Centre for Environment HENVI, Helsinki, Finland, The hidden water consumption; virtual water.
Keynote presentation 26th Annual Water and the Future of Kansas Conference. K-state University, Minnesota, Kansas, US. The water Footprint of Energy from biomass.
Keynote presentation at the Conference at the Hague University of Applied Sciences (Haagse Hogeschool). January 2009.
Keynote presentation 7 energy days, Nuclear Energy & Energy from Wind and Water, Technische Universiteit Eindhoven, December 10 2009
Keynote presentation symposium on water and biofuels. Pietermaritzburg, South Africa, February 10-11 2010.