Paul Souders/ Worldfoto / Forested hills in mist, Ngong Hills, Kenya

Richard Du Toit / Botswana homestead, cattle kraal, Makgadikgadi Salt Pans, Botswana

Cyril Ruoso / Cultivated gardens, Anja Park, Madagascar

Hiroya Minakuchi / Nazca Lines, Peru

Hiroya Minakuchi / Glacier tracks between mountains, Canada

Richard Du Toit / Grassland plains, Masai Mara, Kenya

Luciano Candisani / Itaimbezinho Canyon, Aparados da Serra National Park, Brazil

Luciano Candisani / Itaimbezinho Canyon, Aparados da Serra National Park, Brazil

Scott Leslie / Big Barasway Wildlife Reserve beach, west of Burgeo, Newfoundland, Canada

Scott Leslie / Unprotected coastline west of Burgeo, Newfoundland, Canada

Christian Ziegler / Congo River, Democratic Republic of the Congo

Christian Ziegler / Congo River, Democratic Republic of the Congo