The risks generated day after day by the economic globalization lead to the emergence of new "alter-globalization", "cosmopolitic" utopias. Look for the road which leads to it thus imply to think of a globalization different from the current globalization, which engenders disparities and destruction of the global balances. We show here that the ecologist utopia anchors in a new cosmopolitanism. It is based neither on the unlimited mobility nor on the world integration in a division of labour, having the maximal production for end, but on the just separation.