regulations amending the heavy-duty vehicle and engine greenhouse gas emission regulations and other regulations made under the canadian environmental protection act 1999 146 pages available in english and french . emissions of greenhouse gases ghgs are contributing to a global warming trend that is associated with long-term climate change. in2014 on-road heavy-duty vehicles were the source of about 8 of total ghg emissions in canada. the annual amount of ghgs emitted by these vehicles in canada doubled between1990 and2014 from28 to 56megatonnes mt of carbon dioxide equivalent e per year. in2013 canada began regulating ghg emissions from the on-road heavy-duty vehicle sector however without additional action annual ghg emissions from freight transport the majority of which come from heavy-duty vehicles are projected to continue to increase and surpass annual ghg emissions from passenger transport by2030. in october 2014 a notice of intent was published in the canada gazette part i notified under g tbt n can 431 announcing the government of canadas intention to develo proposed standards to further reduce ghg emissions from heavy-duty vehicles and engines in alignment with those of the united states. the objective of the proposed amendments is to further reduce ghg emissions in canada from new on-road heavy-duty vehicles engines and trailers by establishing more stringent emission standards to hel protect canadians and the environment from the effects of climate change. additionally the proposed amendments aim to maintain common canadaunited states ghg emission standards for heavy-duty vehicles engines and trailers and contribute to minimizing the overall regulatory burden for companies operating in the canadau.s. market. the proposed regulations amending the heavy-duty vehicle and engine greenhouse gas emission regulations and other regulations made under the canadian environmental protection act 1999 the proposed amendments would introduce more stringent ghg emission standards that begin with the 2021model year for on-road heavy-duty vehicles and engines. further the proposed amendments introduce new ghg emission standards that would apply to trailers hauled by on-road transport tractors for which the manufacture is completed on or after january1 2018 starting with model year2018 trailers. these emission standards for heavy-duty vehicles engines and trailers would increase in stringency every three model years to the 2027model year and maintain full stringency thereafter. the proposed amendments would also amend two other regulations made under the canadian environmental protection act 1999 to ensure consistency with existing on-road vehicle and engine emission regulations.