French Foreign Minister and President of the COP21 Laurent Fabius (center) gives a thumbs up while U.N. Secretary-General Ban Ki-moon (left) and French President Francois Hollande applaud after the final meeting of the U.N. conference on climate change in Le Bourget, France, on Saturday. Francois Mori/AP hide caption

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Ousmane Ndiaye loves computer models, climate forecasting and babies. Here he holds farmer Mariami Keita's 4-month-old baby girl, Ndeye. Courtesy of Vanessa Meadu (CCAFS) hide caption

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A view of a phytoplankton bloom near Alaska's Pribilof Islands. The milky green and light blue shading of the water indicates the presence of vast populations of microscopic phytoplankton. NASA hide caption

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A Baltimore oriole perches near apple blossoms in Mendota Heights, Minn. Universal Images Group via Getty Images hide caption

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More Than Half Of U.S. Bird Species Threatened By Climate Change
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They're down there somewhere: The Great Lakes as seen from space on Wednesday. Lake Ontario, which has less ice than the others, is at the lower right. A bit of open water can be seen in Lake Superior, at the upper left. CoastWatch.glerl.noaa.gov hide caption

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On Monday, a weed was growing through the dry earth at Marion Kujawa's pond, which he normally uses to water the cattle on his farm in Ashley, Ill. Scott Olson/Getty Images hide caption

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Drought In U.S. Now Worst Since 1956; Food Prices To Spike, Economy To Suffer
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