An indicator framework for assessing ecosystem services in support of the EU Biodiversity Strategy to 2020Original Research ArticlePages 14-23Joachim Maes, Camino Liquete, Anne Teller, Markus Erhard, Maria Luisa Paracchini, José I. Barredo, Bruna Grizzetti, Ana Cardoso, Francesca Somma, Jan-Erik Petersen, Andrus Meiner, Eva Royo Gelabert, Nihat Zal, Peter Kristensen, Annemarie Bastrup-Birk, Katarzyna Biala, Chiara Piroddi, Benis Egoh, Patrick Degeorges, Christel Fiorina, Fernando Santos-Martín, et al.