Flow velocity and nutrients affect CO2 emissions from agricultural drainage channels in the North China Plain

Environmental Sciences Europe

Table 3 Comparison of CO₂ emissions from groundwater pumping in the NCP with other regions of the world as well as with other CO₂ sources in the NCP

CO₂ emissions	Description	References
9.7–13.5 Mt CO₂ year⁻¹	Groundwater irrigation global estimate	[11]
~ 10 Mt C year⁻¹	Global groundwater extraction	[9]
~ 0.72 Mt CO₂ year⁻¹	Groundwater irrigation in India	[73]
1.7 Mt CO₂ year⁻¹	Groundwater irrigation in the US	[11]
0.52 ± 0.07 Mt CO₂ year⁻¹	Groundwater depletion in the NCP	This study
8.72 Mt CO₂e year⁻¹	GHG emissions of energy use for irrigation water pumping in the NCP	[75]
120.87 Mt CO₂e year⁻¹	GHG emissions from agricultural production process in the NCP by life cycle assessment	[76]
121 Mt CO₂ year⁻¹	CO₂ emissions from central heating supply due to natural gas usage in the NCP	[77]
15.99 Mt CO₂ year⁻¹	Crop burning emissions during harvest seasons in the NCP	[78]