Trudeau defended the accusation, saying the Liberals are buying carbon offsets for the campaign.
He says the Conservative attack is a “well-established, far-right tactic” to discredit environmentalists.
The Liberal campaign says it’s in the process of purchasing the offsets and its total emissions will be known at the end of the campaign.
READ MORE: Reality check: Do carbon offsets work?
The general manager of the company selling carbon offsets to the Liberal campaign says there isn’t a better way currently to ease the greenhouse gas effect from airplanes.
Carbon offsets allow individuals or companies to pay to invest in projects like wind farms or tree planting to reduce overall emissions by the same amount they are producing elsewhere, usually by flying.
Sean Drygas, the general manager at Bullfrog Inc., says carbon offsets are a way to help reduce the climate impact from air travel because there aren’t any lower-emission alternatives to jet fuel.
Keith Stewart, a senior energy strategist at Greenpeace Canada, says offsets are not ideal because there is no certainty the money is going to projects that wouldn’t be built without the offset revenues.
However, Stewart also says he fears the question about the planes and carbon offsets is a major distraction from the conversations Canadians should be having in this campaign about policies to reduce emissions and address climate change.
—With a file from Abigail Bimman