announcer: the "gma" concert, matt stell, friday only on "good morning america."of the most moving images of the decade, not just of the year here. we are counting down to 2020, of course, and national geographic is revealing the top photos but, adrienne, they are the top photos they are looking out of 20 million to choose from. >> oh my goodness, it's just remarkable. let me tell you and these were voted on by, of course, fans and viewers of national geographic. these are the best photos and it still proves that a picture is worth a thousand words or more. these are just some of national geographic's best photos of the decade -- mysterious, haunting, heartbreaking. >> conservation is arguably one of the most important issues of our time. we need to think about how we save our animals, how we save ourselves, how we save our planet. >> reporter: whitney johnson, director of photography for national geographic, says that over the past ten years their photographers have taken more than 21 million pictures like this photo of a hummingbird eating from a microscopic din

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