Climate Change
i learned that climate change is the variation in global pr regional climates over time. it reflects variability. example like variation in sunlight intensity.
http://en.wikipedia.org/wiki/Climate#Climate_change
Global Dimming,
Its when fossil fuel use make clouds reflect the suns rays into space.less heat and energy reach the earth. it is belived that global dimming caused the droughts in ethiopia that killed millions.
http://www.globalissues.org/article/529/global-dimming
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