Roberto Vidales is an ecologist and has been using what he calls “idea trees” as a tool to develop an ecological-holistic view and consciousness about nature and the big challenges we are facing now as human beings — like the global warming or climatic disaster. He uses this idea tree as an educational tool to share with friends, neighbors, local government authorities, and different audiences in Mexico City and surrounding areas. This is Roberto’s second contribution to this website. To see his other map in spanish see http://ideamapping.blogspot.com/2007/06/idea-map-19.html.