Study was done on green house gas emission from crop production, livestock and partIy aquaculture of agricultural sector and to develop mitigation measures for crop production sub-sector. Firstly, GHG emission was estimated for whole sector based on national GHG inventory by IPCC 1996 and modeling methods in more detail using DNDC model and some research results in life Cycle Assessment (LeA) for coffee, tea and aquaculture in years 2000, 2005 and 2010.Secondly, continuously to predict GHG emission for 2015, 2020, 2025 and 2030 based on sector development scenarios including scenario of baseline, sector actions and potential mitigation. Research results showed that GHG emission from agrict.tlture were 95.7 Gg of CO2e in 2000, 100.6 Gg in 2005 and 96.7 Gg CO2e in 2010. Base on planning of MARD up to 2020 and vision 2030, GHG emission was estimated as 109.6 Gg CO2e in 2015, 115.9 Gg in 2020, 119.8 Gg in 2025 and 123.6 Gg CO2e in 2030, mainly due to changing of output (increase crop yield and rising and fishing) while areas of some crops are reducing (rice and sugarcane). In agriculture, paddy rice field has the highest GHG emission, occupying 64.1 to 55.8 percent total emission in 2015 to 2030
livestock waste contains 23.9 to 30.5 percent of total emission. Total GHG emission was predicted as increase rapidly and can reach 123.6 million tons of CO2e in 2030. Because of that mitigation in agriculture should be cared through out developing high tolerable varieties, develop crop insurance mechanisms and implementing mitigation measures, strengthen risk from natural disasters to ensure the sustainable agriculture and to conseve ecological environment in context of climate change.