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4) One controversial example is rice genetically engineered to include beta carotene [vitamin A]. Vitamin A deficiency is a serious problem in both high rice and maize consumption societies. Third world advocates are still at their wits end on this one. "In 2005 a new variety called Golden Rice 2 was announced which produces up to 23 times more beta-carotene than the original variety of golden rice. Neither variety is currently available for human consumption. Although golden rice was developed as a humanitarian tool, it has met with significant opposition from environmental and anti-globalization activists." http://en.wikipedia.org/wiki/Golden_rice