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If we accept that the global climate is changing, and not changing randomly, then the next logical question to ask is, what is causing the change? Obviously, for the purposes of this discussion, we can look at natural causes and potential manmade causes.
See this page for an overview, and the links below for more information about specific aspects.
These are the primary natural causes most cited. Of course, there may be less likely natural causes, like the CO2 emitted by flatulent / burping bovine, but most will agree that the causes above are the most likely.