http://alt-e.blogspot.com/ 2004_08_01_alt-e_archive.html

http://www.nrel.gov/clean_energy/ elec_solarpower.html

http://www.nrel.gov/clean_energy/hydroelectric_power.html

http://danny.oz.au/travel/ iceland/eyrarbakki-floi.html

http://www.petrol.unsw.edu.au/ staff.htm

http://www.afcd.gov.hk

http://3d.faws.org/images. php?PIC=coal-mine

http://www.hkpanda.org/

http://forests.org/asia/2002.asp

http://www.eldis.org/static/DOC14486.htm