Short answers, pulled from the story.
The first organized meetings of ecological economists occurred in 1982 at a gathering held in Sweden. Lois Banner instigated this event bringing together Robert Costanza, Herman Daly, Charles Hall, Bruce Hannon, H.T. Odum, and David Pimentel.
Ecological economics traces its intellectual roots back to the Romantics of the nineteenth century and Enlightenment political economists like Thomas Malthus. Karl Marxian economist Sergei Podolinsky attempted to theorize a labor theory of value based on embodied energy in 1880 while Otto Neurath developed an ecological approach based on natural economy while employed by the Bavarian Soviet Republic in 1919.
A study led by Costanza and colleagues determined the value of services provided by the environment averaged per hectare numbers for wetlands oceans totaling thirty-three trillion US dollars representing 1997 values exceeding total global GDP twice over.
Ecological economics distinguishes itself from neoclassical economics by asserting that the economy is embedded within an environmental system. Neoclassical views ignore much what natural sciences teach about nature contributions to wealth creation including planetary endowment of scarce matter and energy along with complex biologically diverse ecosystems providing goods directly.
The United Nations Environment Programme defines green economy focusing human aspects natural influences generating high salary jobs and its definition developed further in 2011 referring to resourceful well organized impartial economies shifting toward low carbon resource efficiency social inclusion.