Mon, 23 Jan 2012 05:20:02 +0100 (Reuters) - People riding on horsebacks arrive at the Zocalo in downtown Mexico City January 22, 2012. Farmers from Chihuahua and members of the "Hunger Caravan" protest marches, arrived in Mexico City to demand government assistance as the worst drought in seven decades is affecting northern Mexico, causing severe shortage of food and water and destroying crops. REUTERS/Bernardo Montoya (MEXICO - Tags: AGRICULTURE ENVIRONMENT BUSINESS POLITICS ANIMALS)
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