Green State Meaning

(US, idiomatic) Somewhat whimsical term for environmentally friendly state. (In the modern United States) a state that is, or is perceived as, environmentally friendly.

Example: 2007, Neil Carter, The Politics of the Environment: Ideas, Activism, Policy - Page 60
  Indeed, the emergence of a debate about the nature of the green state has been one of the most significant contemporary developments in green political theory.