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References
1. N. U. Ukidwe and B. R. Bakshi, “Flow of Natural versus Economic Capital
in Industrial Supply Networks and Its Implications to Sustainability”
Environmental Science & Technology, 2005, 39, 24, 9759–9769.
2. For more information about sustainable communication, see www.sustainable-
communication.org/.
3. Information about Wal-Mart’s sustainability programs is available at walmart-
stores.com/Sustainability/.
4. Information about JCPenney’s corporate social responsibility programs is avail-
able at www.jcpenney.net/social_resp/default.aspx.
5. More information about McDonald’s environmental programs is available at
www.mcdonalds.com/usa/good/environment.html.
6. Information about UPS’s sustainability programs is available at www.sustain-
ability.ups.m/.
7. Information about FedEx’s DFE programs is available at about.fedex.designcdt.
com/corporate_responsibility/the_environment.
8. Information about Citigroup’s environmental programs is available at www.
citigroup.com/citi/environment/.
9. For more information ab.out sustainable tourism, see www.unwto.org/sdt/.
10. Information about Disney’s environmental programs is available at disney.
go.com/disneyhand/environmentality/environment/index.html.