Seeing Double The top 40 nature photos of all time? In honor of the 40th annual Earth Day on April 22, members of the International League of Conservation Photographers chose their top 40, including this one here. Many of the honored photographers or their trusts went on to donate their work for an Earth Day auction benefiting environmental groups. Ten of those 40 are shown here, including this one by Paul Nicklen of a polar bear and his reflection. Polar bears often travel submerged -- a tactic used to surprise prey -- and this one was spotted at the northern tip of Canada's Baffin Island. Scientists fear melting sea ice habitat due to global warming could drive polar bears to extinction sometime this century. Fished for Fin Underwater documentarian Brian Skerry photographed this thresher shark, doomed by a gill net, in Mexico's Gulf of California. It had been killed for its fin in order to satisify Asian demand for shark fin soup. Conservation groups estimate 100 million sh...
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