Desert in Tucson

http://www.wildnatureimages.com/Tucson%203.htm

https://blazingtrailstogether.wordpress.com/2013/03/12/home-is-where-the-saguaro-is/tucson-overview-desert-sunset-full/ 

http://www.slate.com/articles/technology/future_tense/2014/03/tucson_tries_to_reinvent_itself_in_the_face_of_a_drought.html

Eric  Holthaus