when davide ramos arrived in arizona 80 years ago there was no reception center for migrants. he still waiting for a permanent residence permit. it has a work permit that has to be renewed every 2 years even if he were to be expelled what he's achieved here is something that many back home can only dream of and he earns enough to help support his family in guatemala. here in the u.s. he works as a freelance gardener. gets mother it's a very different from guatemala he is in a lot of roles in the hot season has been moving on there's hardly any water this. arizona has a desert climate and a severe lack of water. life here is only possible thanks to water pipe from a far away colorado river. but the cities of phoenix and tucson still use the resource wastefully. they counted among the least sustainable cities in the world. hundreds of thousands of liters of water go into keeping golf courses in the deserts of greenland. in the arizona desert scientists at the biosphere 2 experimental station are trying to find out how to model and perhaps aid the earth's major ecosystems. the bi