Wheat grown on the Prairies benefits from decades of conservation tillage and residue management, practices that help soils store more carbon than they release.
Canadian-grown wheat, canola and peas have some of the lowest carbon footprints in the world—so low that, in some cases, they could be shipped to Europe 17 times before matching the emissions of the same crops grown there.
The study out of UBC Okanagan, published in Nature Food, compared the carbon footprints of these crops from Canada, France, Germany, Australia and the United States.
Led by Dr. Nicole Bamber of UBCO’s Irving K. Barber Faculty of Science, the research shows that Canada’s lower emissions are mainly due to Canadian soils storing more carbon and farming releasing less nitrous oxide.
This is largely thanks to widespread low and no-till farming practices and the climate of Western Canada.
“The idea that ‘local is always lower-carbon’ doesn’t hold true,” says Bamber, the paper’s lead author. “In fact, for many food products, transportation only accounts for a small part of the emissions.
“When you look at the full lifecycle of crop production, Canada’s prairie-grown wheat, canola and peas consistently outperform their international counterparts, even when you factor in shipping thousands of kilometres to market.”
Dr. Bamber and Dr. Ian Turner, post-doctoral research fellows, worked alongside Associate Professor Dr. Nathan Pelletier in his Food Systems Priority Research for Integrated Sustainability Management Lab (PRISM).
Canada’s low emissions come mainly from reduced nitrous oxide release and the ability of prairie soils to store carbon. This is thanks to decades of conservation tillage and careful farming practices that help soils act as carbon sinks rather than sources.
In other countries, soils often lose carbon because of heavier farming methods as well as less favourable soil and climate conditions.
“Canada’s production advantages aren’t accidental,” says Dr. Pelletier. “They come from deliberate farming choices, supportive policies and environmental conditions.”
The research assessed full lifecycle greenhouse gas emissions from crop production to the farm gate, including fertilizer production, field activities, field-level nitrous oxide emissions and soil carbon changes.
The study questions common beliefs about “food miles” and suggests that buying and marketing decisions should consider more than just distance. The authors say the data can help focus efforts to cut emissions and show how Canadian crops can support global climate goals.
“This gives Canada a competitive edge for Canadian agriculture in global markets that are increasingly sensitive to sustainability,” says Dr. Pelletier.
