In Kenya, the opuntia cactus, also known as the prickly pear, is spreading, destroying thousands of acres of grassland, and making animals that eat it sick. Kenyans have come up with a variety of methods to try to eradicate the problem plant, including breeding a microorganism that feeds on the cactus and also turning it into food for humans. Mohammed Yusuf reports from Ilpolei, Kenya.
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