Various issues are often raised in relation to global warming. One is rise of temperature. Second is extraordinary weather. Third is rise of sea levels. . These issues are a matter of life and death. First, rise of temperature is caused. For that reason, rise of sea levels was caused. Besides coral can’t inhabit present habitat. Therefore, global warming is critical problem for living thing on the earth.
http://en.wikipedia.org/wiki/Global_warming#Related_climatic_issues
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