Key issues on green economy at Rio+20

This paper discusses the key issues surrounding green economy at Rio+20 in three categories: "principles of a green economy‟, "policy tools for transition towards green economies‟ and "international cooperation for green economies‟. The discussion is based on current trends in the discussion of green economy in the Rio+20 process, which can be apprehended in the zero draft published in January 2012, and from views and opinions expressed by the G20 (Group of Twenty) countries during the Rio+20 process meetings.