Costs and Benefits of Reducing Nitrous Oxide Emissions from Canadian Agriculture finds that the federal government’s plan to lower nitrous oxide emissions in the Canadian agricultural sector will impose costs in excess of $1.6 billion, but will provide no measurable benefit in lower GHG emissions. In fact, nitrous oxide emissions make up just 4.5 per cent of Canada’s total greenhouse gas emissions, and only 0.07 per cent of global GHG emissions.