Now that the fantastic adventure begun in the 15th century has come to an end, the shout of Columbus’ lookout man takes on at last a planetary meaning: Land! Land!1 Even up to 1950-1960, we were living on a misapprehended Earth, on an abstract Earth. We were living on the Earth as object. By the end of this century, we discovered Earth as system, as Gaia, as biosphere, a cosmic speck—Homeland Earth. Each one of us has a pedigree, a terrestrial identity card. We are from, in, and on the Earth. We belong to the Earth which belongs to us