... during agricultural and industrial activities, as well as during combustion so solid waste and fossil fuels. (www.epa.gov) Other very powerful greenhouse gases that are not naturally occurring include hydro fluorocarbons (HFC's), perfluorocarbons (PFC's), and sulfur hexafluoride (SF6), which are generated in a variety of industrial processes. Each greenhouse gas differs in its ability to absorb heat in the atmosphere. HFC ... ...

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