Environment Canada estimated GHG emissions from the agriculture sector at 75 megatons (Mt) carbon dioxide equivalent (CO2 eq) in 2013, or 10.3% of all Canadian GHG emissions. In the same year, the oil and gas sector emitted 179 Mt (CO2 eq), or 24.7% of all Canadian emissions. The transportation was second with 170 Mt (CO2 eq), or 23.4% of all emissions. 
(source: Canada's "Second Biennial Report submission on Climate Change to the UNFCCC", April 2016)
Reducing driving and flying has more impact on reducing global GHG emissions (less fuel produced and burned) than reducing emissions from the agricultural sector. We have to work on all sectors to reduce emissions, but the oil and gas sector and transportation are primordial.