An interesting lecture from 2013 SCAA Symposium by Aaron Davis; a botanis.
http://www.youtube.com/watch?feature=player_embedded&v=pr5Iis_J6-U#!
It is focused on the issue of arabica being a very small part of the wild coffee species in Africa, and due to climate change, why it is looking like it might be tough to continue current growing practices to produce arabica.
Of all the coffee grown outside of Africa, there is less than 1% of genetic variance; compared to the species growing in Ethiopia !!
Lack of genetic variance is partly why leaf rust is such a problem for the industry.
The Cooling Tray Sessions 