These are based on information from various sources. There are also significant differences in figures from various sources. Bioenergy is renewable energy made available from materials derived from biological sources. Such factors facilitate estimation of emissions from various sources of air pollution. Information provided by sources varies widely. Correlation can arise from two different sources. Quercetin is present in various kinds of honey from different plant sources. It also includes all output identified as coming from U.S. official sources. These deficits require funding from other tax sources or borrowing. This article contains a compilation of lists from several reliable sources. Primary production is the production of organic matter from inorganic carbon sources. These differ in their sources and methods. This is consistent with earlier research on sources. BCE was one of the only sources of information for later historians. This was more than his earnings from other sources.