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One theory among scientists is that the atmosphere of the young Earth contained much larger quantities of greenhouse gases ( such as carbon dioxide , methane ) than are present today , which trapped enough heat to compensate for the smaller amount of solar energy reaching it .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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