ALL right to start off;
from http://www.greenhomebuilding.com/QandA/earthshipQandA.htm -
"Michael Reynolds, creator of the Earthship concept, is a world leader in environmental building. He is the author of five books and has 30 years experience designing and building fully self-sufficient homes. The innovative Earthship design combines passive solar heating with thermal mass construction to create buildings that heat and cool themselves without consuming fossil fuels. Earthships create all their own electrical power with sun and wind, collect and treat their own water with integrated water systems. The main building block of the Earthship makes use of one of the worlds most plentiful, and most troublesome “natural resources”, scrap automobile tires. Thousands of Earthships have been built all over the world in the US, Canada, Mexico, Bolivia, Japan, South Africa, Honduras and Belgium. Michael's Earthship/Biotecture website provides a wealth of information about his innovative building concepts."
So we are still on the LAND then WATER as the primary (starting out) concerns. I will com back to to my posts as I investigate further.
and from the same site;