Photo Gallery: How Typhoon 'Haiyan' Became a Monster
Foto: DPA/ NOAA
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Photo Gallery: How Typhoon 'Haiyan' Became a Monster

Climate Research Lessons from Typhoon 'Haiyan'

Many at the climate conference in Warsaw and around the world see a link between global warming and the devastating typhoon in the Philippines. But several studies point to other causes -- and even more worrisome trends.
Cyclone frequency data

Cyclone frequency data

Foto: American Meteorological Society
With graphics by Christina Elmer