Nonrenewable Energy Cost and Greenhouse Gas Emissions of a “Pig-Biogas-Fish” System in China

Table 4

GE of the “pig-biogas-fish” system.

	Direct GHG; (kg CO2-eq/yr)	GEin; (kg CO2-eq/yr)	GE; (kg CO2-eq/yr)
Pigsty	2.76𝐸+02	1.76𝐸+03	2.04𝐸+03
Biogas	1.17𝐸+03	3.16𝐸+02	1.48𝐸+03
Fishpond	1.69𝐸+03	9.56𝐸+02	2.65𝐸+03
Total	3.13𝐸+03	3.03𝐸+03	6.17𝐸+03
Ratio	50.82%	49.18%	100.00%