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Alongside this expansion in the world ' s population , rapid economic growth in China , India and South America is increasing demand for protein - rich foods , especially meat and dairy products , causing concern about the impact this may have on green house gas emissions .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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