Florida's Everglades National Park, the largest wetland in the United States, is under threat from climate change and has become a battleground for one of the most sweeping ecological conservation efforts on Earth. But time is running short, and global warming is sabotaging a subtropical wilderness that is home to more than 2,000 species of animals and plants. "I think it’s crazy that we had to get this far along" before organized efforts to protect the Everglades emerged, says Umberto Lazaro Gimenez, an airboat captain who works amid the Everglades. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES