There has been some opposition in the ag sector to Prime Minister Justin Trudeau's announcement of a proposed carbon tax across Canada.

Levi Wood, President of the Western Canadian Wheat Growers Association, says the tax will have big impacts on farmers' bottom line, and through the whole value chain from the field to export.

He adds many of the fossil fuels and energy-intensive products used to producing crops and in farmers' lives are not discretionary.

"There might be places it can be more efficient at times, but generally I'd say that western Canadian agriculture is very efficient in terms of our production.

I think that maybe we're not being given enough credit for the advances that have happened in agriculture.

I think a lot of advances have contributed to what is certainly a more sustainable and, in my mind, a more environmentally effective way of growing our crops," he said.

Wood explains farmers in general were surprised by Prime Minister Justin Trudeau's announcement of the carbon tax, and believes there are a lot of unknowns and not a lot of upside for the ag sector.

"You start to look at the carbon tax and you start to wonder, going forward, what kind of impact it's going to have on our bottom line.

It permeates our whole value chain as grain farmers - will it affect how we end up getting all of our products to our international customers," he said.

Wood says the Wheat Growers have launched a petition against the carbon tax, adding so far, it has received a couple thousand responses to it.