1. UNEP Convention on Biological Diversity
http://www.biodiv.org/

2. The World Resources Institute
http://www.wri.org/wri/wri-ndex.html

3. JPL NASA evidence
http://trfic.jpl.nasa.gov/

Zaheer's references:

4.http://www.beijer.kva.se/networks/gwen.htm

5.http://www.cgrer.uiowa.edu/servers/servers_envorgs.html

6.http://www.environmentaldefense.org/programs/international/

7.http://www.gn.apc.org/dte/

8.http://www.invasivespecies.gov/other/org.shtml

9.http://www.snre.umich.edu/ecomgt/resources/international.htm

10.http://www.unep.org/

11.http://www.unep-wcmc.org/

12.http://www.epa.gov

Sarah Masons's references:

14.http://www.iucn.org/

15.Red Data Book
http://www.redlist.org/

16.http://www.panda.org/

17.CITES
http://www.cites.org/eng/disc.what_is.shtml
18.Rio Convention
http://www.gtz.de/biodiv/english/e_background.htm
19.WRI
http://www.wri.org/action_stories.html

20.UNEP
http://www.unep.net?biodiversity/

21.http://www.youth2002jeunesse.unac.org/english/index.htm

22.http://www.unac.org/bp/english/Mosaic.html