There appear to be very few "technical" references that provide a good background in this area, though I do remember reading one or two articles in newspapers about the problems in Silicon Valley as the result of waste from chip companies. Provided below is an initial set of references and a newsgroup paper which may be useful.
Bendz, Dianna J. Sept. 1993. "Green Products for green profits", IEEE Spectrum, pp. 63 ff.
Howard, Bill. 30 Mar. 1993. "The Politically Correct PC", PC Magazine, Vol. 12, No. 6, p. 105.
Machrone, Bill. 23 Feb. 1993. "My Computer's Turning Green", PC Magazine, Vol. 12, No. 4, pp. 87-88.
Nadel, Brian. 25 May 1993. "The Green Machine", PC Magazine, Vol. 12, No. 10, pp. 110 ff.
Perry, Tekla S. Feb. 1993. "Cleaning Up", IEEE Spectrum, pp. 20ff
Rist, O. 11 May 1993. "How Green is Your PC?", PC Magazine, Vol. 12, No. 9, p. 30.
Young, John Edward. 1993. "Global network : computers in a sustainable society", Washington, DC : Worldwatch Institute, 57 p.
"Old PCs pile up", by Traci Watson, USA TODAY,
22 June 1999.
Yurman, Dan. "Green Technology Markets; Opportunities, Barriers & New Paradigms", posted by firstname.lastname@example.org 9 June 1994. This paper contains an extensive bibliography. Wallach, Dan S. (1994) "Typing Injury FAQ: General Info" Usenet news.answers. Available via anonymous ftp from rtfm.mit.edu in pub/usenet/news.answers/typing-injury-faq/general. 7 pages.
World-Wide-Web users will find this available as hypertext: http://www.cis.ohio-state.edu/hypertext/faq/usenet/typing-injury-faq/top.html
You may also want to try Dan Wallach's page: http://www.cs.princeton.edu/~dwallach/tifaq
Intel Corp. has an "Environment, Health and Safety Report" that may be useful.
The RISKS bulletin board, recently made accessible from this set of pages, may contain some useful information on this topic. However, the key words "Green Machine" may not be the most suitable to find entries.
Finally, we do have a computer recycling company in our area -- R. Frazier, Inc. They used to have a home page on BEV but it is no longer there. I believe they are located in Salem VA.
"Guide to Energy-Efficient Office Equipment" By Marc Ledbetter, Pacific Northwest Laboratory.
List of efficiency-related internet sites. There are several information sites that may be of interest.