CO2

Friedlingstein 2015 Nature Persistent growth of CO2 emissions and implications for reaching climate targets

http://www.nature.com/ngeo/journal/v7/n10/pdf/ngeo2248.pdf

Efforts to limit climate change below a given temperature level require that global emissions of CO2 cumulated over time remain
below a limited quota. This quota varies depending on the temperature level, the desired probability of staying below this level
and the contributions of other gases. In spite of this restriction, global emissions of CO2 from fossil fuel combustion and cement
production have continued to grow by 2.5% per year on average over the past decade. Two thirds of the CO2 emission quota

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Karhu et al., Temperature sensitivity of soil respiration rates enhanced by microbial community response Nature

Soils store about four times as much carbon as plant biomass1, and soil microbial respiration releases about 60 petagrams of carbon per year to the atmosphere as carbon dioxide2. Short-term experiments have shown that soil microbial respiration increases exponentially with temperature3. This information has been incorporated into soil carbon and Earth-system models, which suggest that warming-induced increases in carbon dioxide release from soils represent an important positive feedback loop that could influence twenty-first-century climate change4.

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Karhu et al., Temperature sensitivity of soil respiration rates enhanced by microbial community response Nature

Soils store about four times as much carbon as plant biomass1, and soil microbial respiration releases about 60 petagrams of carbon per year to the atmosphere as carbon dioxide2. Short-term experiments have shown that soil microbial respiration increases exponentially with temperature3. This information has been incorporated into soil carbon and Earth-system models, which suggest that warming-induced increases in carbon dioxide release from soils represent an important positive feedback loop that could influence twenty-first-century climate change4.