Of course, it's the capitalist pigs fault (read USA and Bush and big oil and the Texas Rangers or 'insert any fruitcake reason here') there is global warming, which creates a dramatic climatic change, doncha know. See how easy it is?
There's so many to choose from. I think the source of all the worlds problems is that in 1990 (before the Gulf War mind you) George W. Bush personally injected Jose Conseco with steroids. (/tin foil hat)