Jeff Foott / Hiker near waterfall and rainbow, Nevada Fall, Yosemite National Park, California

Suzi Eszterhas / African Elephant (Loxodonta africana) in defensive posture towards safari vehicle, Sabi Sands Private Game Reserve, South Africa

Richard Robinson / False killer whales (Pseudorca crassidens) traveling with a pod of pelagic Bottlenose dolphins (Tursiops truncatus) Northern New Zealand

Yva Momatiuk & John Eastcott / Canoe on river in summer, Hudson River, Hudson Gorge Wilderness, New York

Yva Momatiuk & John Eastcott / Ice climber scaling Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Ice climbers atop Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Ice climber scaling Skaftafellsjokull Glacier, Skaftafell National Park, Iceland

Yva Momatiuk & John Eastcott / Tourist next to cascades, Dynjandi Waterfall, Westfjords, Iceland

Matthias Breiter / Ferry moving between icebergs, Ilulissat, Greenland

Matthias Breiter / Tourist and icebergs, Ilulissat, Greenland

Colin Monteath/ Hedgehog House / Kayakers paddling back to cruise ship Polar Pioneer, Lemaire Channel, Antarctic Peninsula, Antarctica

Pete Oxford / Yellow-tailed Surgeonfish (Prionurus laticlavius) school and snorkeler, Galapagos Islands, Ecuador