Our ecological footprint : reducing human impact of the Earth /

Autor Wackernagel, Mathis, 1962-, Rees, William E., 1943-
Vydáno 1996

Sharing nature's interest : ecological footprints as an indicator of sustainability /

Autor Chambers, Nick, Simmons, Craig, Wackernagel, Mathis, 1962-
Vydáno 2000