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Genetically modified plants are also another recent development. These have become controversial in places because it is not clear what the long-term impact of these plants might be. Many such modified plants have similar or the same genes. This potentially makes domesticated crops susceptible to plant disease that can kill many plants. If genetics are similar, and there is a lack of genetic diversity, then hunger could be a result of a major crop-killing disease.<ref>For more on genetically modified foods, see: Roller, S., & Harlander, S. (1998). <i>Genetic Modification in the Food Industry: a Strategy for Food Quality Improvement.</i> Boston, MA: Springer US.</ref>
Globally, agriculture is a more than 3.0 trillion dollars industry, where domesticated plants makeup a large-bulk of this business. While agriculture has freed up many people for other pursuits, it is also a major employer around the world, we more than a billion people are involved in agriculture in some way.<ref>For more on the modern industry of agriculture, see: Miller, F. P., Vandome, A. F., & McBrewster, J. (2009). <i>Industrial agriculture: factory farming, livestock, aquaculture, agribusiness, monoculture, agroecology, organic farming, urban agriculture.</i> U.S.A.; U.K.; Germany: Alphascript Pub.</ref>
==Summary==
