When raising important social issues in science centres and museums there is often a question about how far we can or should go in presenting an issue, stating an opinion and asking visitors to take an active role. This approach is viewed by some as counter-productive and contrary to the objective of allowing the visitor the freedom to make up their own minds. This panel session, based on different case studies related to environmental of public health issues, will discuss various methods used to advance nature-related arguments. This session is part of Ecsite’s Nature Group program.