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Global warming affects tropical life more

Seattle -- Global warming is greatest in the Northern Hemisphere but its impact on life could be much greater in the tropics, a U.S. study says.

Even with smaller increases in temperature in the world's tropical zones, those regions could see greater impacts on life, ranging from shifting geographic ranges to species extinction, says Michael Dillon, an assistant professor of zoology and physiology at the University of Wyoming.

A study focused on ectothermic, or cold-blooded, organisms, those whose body temperature approximates the temperature of their surroundings.