With an estimated 70bn animals eaten every year and veganism on the rise, meat-eater Liz Bonnin investigates the ethical and environmental concerns associated with our continuing hunger for flesh. Bonnin travels through the steak-heartland of Texas, visiting a gargantuan, cattle-filled feed farm before witnessing how corporate ownership of livestock leads to massive waste production, and the pioneering farmers turning cowpats into biogas. A stomach-churning watch. Ammar Kalia
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