Before blaming global warming, shouldn't someone point a finger at the government in Khartoum for arming, supplying, and providing air support to the Janjaweed? Oh, wait, that makes too much sense.
What about the alternative theory that the Darfur conflict is the result of finding make-work for the generals who were formerly in charge of the civil war in the south?
Gosh, don't the Chinese like buying Sudanese oil? Perhaps they are supplying Khartoum with weapons knowing that the weapons will be used to commit genocide in Darfur. This fits Chinese interests nicely: they will be Sudan's only friend, which means they keep buying oil from Sudan.
Also, hasn't the Sahara Desert been growing in size for centuries if not millenia? If this is the case, what does global warming have to do with it? Could it be that Mother Nature, pitiless harpy that she is, is behind all this?
I'm sure that there are other much more plausible explanations for Darfur than global warming.