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@prefix dcterms: <http://purl.org/dc/terms/> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . @prefix gcis: <http://data.globalchange.gov/gcis.owl#> . @prefix cito: <http://purl.org/spar/cito/> . @prefix biro: <http://purl.org/spar/biro/> . <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/the-north-american-carbon-budget/finding/key-message-2-2> dcterms:identifier "key-message-2-2"; gcis:findingNumber "2.2"^^xsd:string; gcis:findingStatement "Fossil fuel emissions were the largest carbon source from North America from 2004 to 2013, averaging 1,774 Tg C per year (±5.5%). Emissions during this time showed a decreasing trend of 23 Tg C per year, a notable shift from the increasing trend over the previous decade. The continental proportion of the global total fossil fuel emissions decreased from 24% in 2004 to 17% in 2013 (<em>very high confidence</em>)."^^xsd:string; gcis:isFindingOf <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/the-north-american-carbon-budget>; gcis:isFindingOf <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report>; ## Properties of the finding: gcis:descriptionOfEvidenceBase "Key Finding 2 is supported by fossil fuel inventories collected by the Carbon Dioxide Information and Analysis Center (CDIAC) and made available in the territorial fossil fuel carbon emissions dataset (Boden et al., 2017). Among the various sources of emissions data (see Appendix E: Fossil Fuel Emissions Estimates for North America), the CDIAC dataset was chosen for its consistency and length of record. However, to represent the data uncertainty, the SOCCR2 assessment used the fractional range of estimates from five different inventories, averaged over time."^^xsd:string; gcis:assessmentOfConfidenceBasedOnEvidence "There is very high confidence that fossil fuel emissions are the dominant source of carbon from the North American continent."^^xsd:string; gcis:newInformationAndRemainingUncertainties "The absolute values of greenhouse gas (GHG) emissions levels from energy consumption and production vary significantly due to differences in system definitions, inclusion of industrial process emissions, emissions factors applied, and other issues (see <a href='https://carbon2018.globalchange.gov/chapter/3'>Ch. 3: Energy Systems</a>). Accuracy of the fossil fuel emissions estimates is less certain at finer spatial and temporal scales, and uncertainty at the scale of individual cities is not well constrained (Gurney et al., 2015; Hutyra et al., 2014; Rayner et al., 2010). Furthermore, the magnitude of methane (CH<sub>4</sub>) leakage from fossil fuel production and use has a high degree of uncertainty in the inventories (Brandt et al., 2014)."^^xsd:string; a gcis:Finding . ## This finding cites the following entities: <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/the-north-american-carbon-budget/finding/key-message-2-2> prov:wasDerivedFrom <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/preface/figure/figurep-4>.