This volume addresses the interlocking themes of realism, objectivity, existentialism and (eco-socialist) politics, based on critical realism. However, it moves beyond the purely scientific orientation of earlier contributions to this philosophy, to further develop the themes.The title essay defends objectivity in science, everyday knowledge, and ethics, and examines both subjective idealism and existentialist critiques of objectivity. The other essays examine some of the same themes but from different angles, keeping the politics of the issues at the forefront.