Factor four Doubling wealth, haling resource use /

per Weizsacker, Ernst Von Etc
Publicat 2005

Factor Five, Transforming the global economy through 80 % improvements in resource productivity

per Desha, Cheryl, Hargroves, Karlson Charlie, Smith, Michael H, Stasinopoulos, Peter, Weizsacker, Ernst Von
Publicat 2009