
Changes in CO2 emissions and land-based sinks in two recent decades, showing among-year variation (vertical lines: minimum and maximum estimates among years; boxes: 25th and 75th quartiles; horizontal line: median). Total CO2 emissions, as well as total CO2 emissions from fossil fuels, have risen; land-based carbon sinks have increased slightly, but at a much slower pace. (Data from EPA 2012
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Ecosystems & Biodiversity, Carbon Cycle, Energy
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