When it comes to climate policy, clean infrastructure investments are necessary but most emission reductions will come from a combination of carbon pricing and regulations, such as fuel, vehicle and power standards, write Merran SmithandSarah Petrevan.

With transportation responsible for a quarter of emissions, it will be hard to meet the federal government's national pollution targets without addressing Canada's car conundrum, write Merran SmithandSarah Petrevan.