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Global warming is causing climate belts to shift toward the poles and to higher elevations. To keep pace with these changes, the average ecosystem will need to shift about a quarter mile each year, says a new study led by scientists at the Carnegie Institution. For some habitats, such as low-lying areas, climate belts are moving even faster, putting many species in jeopardy, especially where human development has blocked migration paths.

Read More, link:- http://edro.wordpress.com/2009/12/27/shrinking-world-shrinking-ecosystems/