Paul Krugman offers us the data on global climate, rather than the random cherry-picking of temperatures technique favored by the denialists:

Now you don’t really need that trendline (which he tells us is a third-degree polynomial) to see what’s happening here. On the one hand, the temperature is subject to a lot of fluctuations. On the other hand, temperatures are rising over time. And we have very solid scientific evidence to suggest that the increasing presence of carbon dioxide in the atmosphere is to blame. And unless we shift policies, every year not only will there be more CO2 in the atmosphere, but we’ll continue adding CO2 at an increasing rate, making the climate curve steeper and steeper.
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