HAVANA (AP) - Fidel Castro said Saturday that consumerism in the United States, the perennial enemy of his communist government, is threatening humanity's very existence. Castro used the latest of his «Reflections of the Commander in Chief» columns to lambast American capitalism, quoting a former Russian defense official who says the world must stand up to the United States and its money-grubbing ways. «Commercial advertising and consumerism are incompatible with the survival of the species,» Castro wrote in the essay titled «Hard and Obvious Realities» and published in Cuba's two leading state-controlled newspapers. Castro turns 81 on Aug. 13 and...