This is a rather old site but he has some very interesting ideas he experimented with on grey water purification systems, composting toilets, building with adobe, cement ponds, solar greenhouses and cooling towers in an addition he added to his house in the southwest valley of Albuquerque, New Mexico.
I did a google search on Paul Lusk and came up with the book Building to Endure: Design Lessons of Arid Lands available at Amazon. It looks interesting and no this is not an endorsement and no I receive no money for anything I put on this site. If anybody knows more about Paul Lusk I hope you will post it in comments.