[Cob] Learn all about Sustainability

[Pack]

I found a FREE course: "introduction to sustainability" at Coursera.org
if anyone is interested in learning everything there is to know about
sustainability:

https://www.coursera.org/course/sustain 

There's a free book on the subject: 
http://cnx.org/content/col11325/latest/ 

I sometimes have a problem explaining the concept of sustainability to folks.
I guess this is somewhat on topic. 

Packy