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NASA's Jet Propulsion Laboratory has some great information up about climate change. The CO2 chart above is a pretty compelling piece of evidence for anyone who wants a long-long term picture of what human activity over the last 60 years has done to the atmosphere.
As for reasons to be concerned about the warming trend under way as a result, NASA has this to say:
"The current warming trend is of particular significance because most of it is very likely human-induced and proceeding at a rate that is unprecedented in the past 1,300 years."
Check out the entire climate change site at NASA/JPL. (A big hat tip to Gristmill for this)
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