Mid Sweden University

The accelerated loss of biodiversity, impaired ecosystem services, and lack of policy action pose a major threat to human welfare. The installation of an Intergovernmental Science-Policy Platform for Biodiversity and Ecosystem Services (IPBES), as decided upon at the UN general assembly in December 2010, will provide a much needed framework to better coordinate global response to biodiversity loss. The Busan Outcome laid out the foundation of the structure, function and governance of the IPBES. However, the main goal is to make IPBES credible and effective. Here we discuss three main challenges for IPBES: (1) How to identify topics for the agenda and the assessments, (2) how to organise the assessment process, and (3) how to make findings more policy relevant. In this contribution we recommend that scientists actively act as "early warners", identify pertinent topics that unify different stakeholders, and reflect the characteristics of the different regions and scales. Science has to be independent and improve its communication e.g. through the elaboration of different models and policy scenarios. A short reflection on fairness and effectivity leads to the conclusion that trust due to transparency will be one of the main factors that determines the success of IPBES. © 2011 Elsevier Ltd.