The concentration and centralization of the agro-business multi-nationals advances with gigantic strides: Potash Corp and Agrium have combined into a $30 billion monopoly over the world fertilizer market. Dow Chemical and DuPont combine in a $130 billion dollar deal in the seed and agricultural chemicals sector. ChemChina prepares to takeover Syngenta in a $44 billion acquisition. Bayer is preparing to …