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where to buy benadryl For this study, published in the online edition of the Proceedings of the National Academy of Sciences, the researchers used the inverse approach to gather their calculations then the EPA and the EDGAR system typically use. That method accounts for all known sources of emissions that have been measured in the past, such as samples and calculations from livestock ranches, wastewater, agriculture, landfills, coal mines, and petroleum and natural gas facilities, according to the study.