Climate changeis a change in the statistical distribution of weather over periods of time that range from decades to millions of years. It can be a change in the average weather or a change in the distribution of weather events around an average (for example, greater or fewer extreme weather events). Climate change may be limited to a specific region, or may occur across the whole Earth

In recent usage, especially in the context of environmental policy climate change usually refers to changes in modern climate. It may be qualified as anthropogenic climate change, more generally known as "global warming" or "anthropogenic global warming" (AGW).

 There is now ample evidence of the ecological impacts of recent climate change, from polar terrestrial to tropical marine environments. The responses of both flora and fauna span an array of ecosystems and organizational hierarchies, from the species to the community levels. Despite continued uncertainty as to community and ecosystem trajectories under global change, this paper exposes a coherent pattern of ecological change across systems. Although world is only at an early stage in the projected trends of global warming, ecological responses to recent climate change are already clearly visible. This framework deals with climate change and its effect on people at global level

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Tue, 12/04/2011 - 15:08