Climate change is the variation in the earth's global climate or in regional climates over time. It involves changes in the variability or average state of the atmosphere with regard to temperature, wind, moisture etc. over dweations ranging from decades to millions of years. In recent usage, specially in the content of environmental policy, the term "climate change often refers to changes in modern climate i.e. global warming.
Large volcanic eruption can cause the earth to cool over a couple of years, because huge amount of pollution injected into the air block out a lot more sunlight. this type of climate change can also occure when a large comment or mmeteorite strikes the earth. Other processes can change the earth's climate, but only very, very slowly, over millions of years when continents move around the world and when mountaing ranges are built, the changing patterns and landmasses affects the way the heat in the atmosphere and in the ocean is stored. I t takes along ime to bring the climate into its original condition by minimizing the green house affect in the atmosphere.
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