There is no single institution able to cover, oversee, dominate, manage, handle, or simply trace ecological issues of large shape and scope. Many issues are too intractable and too enmeshed in contradictory interests. We have problems, but we don't have the publics that go with them. How could we imagine agreements amid so many entangled interests? We will review several attempts to tackle ecological problems by connecting the tools of scientific representation with those of arts and politics and present the program of Experimentation on Arts and Politics which has been running at Sciences Po since September 2010