Climate change today represents a major societal topic in relation to which opinions are expressed by both so-called ‘lay persons’ and ‘experts’ – a distinction which, however, remains rather blurred. While daily-life assumptions about ever hotter summers and wetter winters, respectively, might easily become subject to mutual agreements, in professional spheres climate change is nothing unquestioned. Depending upon concrete fields of expertise, climate change might be an obvious problem to researchers but not to the stakeholders that are to be involved in the respective research project. How, then, to decide upon the relevance of a certain topic? Who defines the problem and whose representations are ‘right’ in such a case in the end?In the paper we will discuss some considerations on this ambiguity based upon first insights from an ongoing research project that deals with interdependencies between land use and climate change in Germany (CC-LandStraD). The inter- and transdisciplinary project covers all relevant land use sectors (agriculture, forestry, settlements and transport as well as nature conservation) and, by way of interdisciplinary modelling, intends to develop future land use scenarios under conditions of climate change. By scientists, agrarian, forestal, settlement and transport land use and nature conservation are expected to contribute to climate change mitigation but at the same time also to adapt to the predicted impacts of climate change. In such an understanding, ongoing land use change will progress also in the future. In a transdisciplinary endeavour, the project tries to involve stakeholders from relevant national associations and interest groups repre-senting all of these land use sectors. One of the methodological tools applied are semi-structured interviews in which the stakeholders’ perceptions of climate change impacts and potential or necessary mitigation and adaptation measures are explored. In future project workshops, the stakeholders are then expected to present their views on the meaningfulness of the developed scenarios, the indicators considered and the expected outcomes. The stakeholders are thus ascribed a major role not only in the process of the project but also for its progress and overall outcomes. While from the perspective of applied research (and research funding, respectively) this role is becoming desirable and almost fashionable, it is questionable whether all of the stakeholders really want to play it as it makes science (even) more uncertain to them.Currently, the interviews are being carried out. Therefore, the 2012 IAPS conference is a good opportunity to reflect upon some expected and unexpected findings.