In the second Nexus lecture, Amartya Sen argues that a theme like the environment shows us that values and norms should be taken into account in economical analyses, both in order to get a truly clear view of the issue at stake and in order to be able to formulate a solution. For this purpose, economical analysis as it is now needs to be expanded. At the same time, it is important to approach these kind of issues economically. In that way, we can prevent the discussion from being merely limited to a commitment to awareness-raising.