Mongabay: I moved to San Francisco six months ago and my umbrella hasnt left its dusty sleeve yet. Scientists and politicians, everyone agrees: California is in deep trouble. As the state enters its fourth year of drought and the soil has never been drier. Some look at the sky with hope that El Nio will bring much needed rain. But most are starting to wonder if this is just the beginning. Are we entering a mega-drought that could last for more than a decade? Agriculture, one of Californias strongest pillars,...