In his book The Sky People, Brinsley LePoer Trench argues that not only Adam and Eve but Noah lived on Mars. He states that the biblical description of a river watering the garden and then parting into four heads is inconsistent with nature. Only canals can be made to flow that way, and Mars, supposedly, had canals. So the Garden of Eden was created on Mars as an experiment by Space People. Eventually the north polar ice cap on Mars melted, and the descendants of Adam and Eve were forced to take refuge on Earth.