Observing human CO2 emissions

Gurney, K. (2011), Observing human CO2 emissions, Carbon Management, 2 (3), 223-226.
Abstract: 

The interaction between the Earth’s carbon cycle and climate change remains a top element of uncertainty within climate change projections. In order to better understand this relationship, carbon cycle scientists use a variety of modeling and observational tools to disassemble the many fluxes and reservoirs that constitute the global carbon cycle.