The main objective of this study to quantify and evaluate CO2 emissions related to fuel consumption for the second crop sunflower cultivation in agricultural regions of Turkey. The farms, cultivated sunflower as the second crop, were surveyed in all agricultural regions of Turkey. The total diesel consumption of the tractor and combine harvester was 59.95 L per hectare. The total diesel consumption for seedbed preparation was 29.45 L per hectare. It was found that the total fuel (diesel+lubricant oil), energy consumptions and CO2 emissions for the second crop sunflower cultivation were 60.62 L/ha, 2249.74 MJ/ha and 166.48 kgCO(2)/ha, respectively. The specific values of fuel consumption, seed production, energy consumption related to total fuel and CO2 emission were to be 32.42 L/t, 30.85 kg/L, 1203.07 MJ/t and 89.03 kgCO(2)/t, respectively.