Education
He competed at the 1964 Summer Olympics in the coxless fours, together with Jim Enters, Herman Boelen and Sipke Castelein, and finished in fourth place.
He competed at the 1964 Summer Olympics in the coxless fours, together with Jim Enters, Herman Boelen and Sipke Castelein, and finished in fourth place.
Son of a doctor, Wartena studied literature and worked at a university library in Amsterdam. In the 1970s he moved to a village in southern France, where he learned farming and in 2003 founded the movement Terre de Liens devoted to ecologically friendly agriculture.