UNEP: "green World System research"?

What, if anything, is the difference between "green" World System research a
la Bergesen, Chase-Dunn, Grimes, Parisi and other WS scholars and -- on the
other hand, the "green" work of the United Nations Environment Programme
(UNEP)?

REFERENCES:
(1) Journal of World Systems Research, vol. 3, no. 3 (1997) [Special Issue
on the Environment]
http://csf.colorado.edu/jwsr/archive/vol3/vol3num3.htm
(and click from there)

(2) UNEP, Global Environmental Outlook (GEO1 Report,1997), Executive Summary
http://www1.unep.org/unep/eia/geo1/exsum/ex1.htm
(and click from there)

One main difference is that UNEP was there first and the World(-)System(s)
school is a Johnny-come-lately, as far as "green" research is concerned.
Bergesen/Parisi write (JWSR, vol. 3, no. 3 (1997), p. 364):

 "The turn toward the environment in any number of  disciplines has resulted
in the greening of this and that area of study. Now it is world-system
studies turn. It is a little late; but better late than never."

Major similarities include: (1) treating the world as an integral system;
(2) seeing a conflict between environmental sustainability/protection and
capitalist economic growth; (3) being keenly aware of global rich-poor
(center-periphery) stratification and its relationship to the environment.

Bergesen/Parisi  (in their introduction to the quoted issue of JWSR) point
to some special features of green WS work, but these seem to me more like
"ripples" than major differences with UNEP work.

Peter, did I get this right?

Citizen Kohler
Oakville, Canada