This paper uses Beck's concept of reflexive modernity, and a Foucauldian approach, to critique the positivist philosophy associated with contemporary conventional economics, and to show its inadequacy for the environmental emergency. The paper suggests economics is not neutral but performs an ideological function in justifying the political and social order. Economics can be deconstructed by tracing its history, thereby laying bare its philosophical and political roots. The environmental debate repeats past debates of the 1920s and 30s. By employing the 'subjugated' institutional economics approaches economics can be redefined, and the path to a truly Green New Deal can be unearthed.