First of all, I'd just like to point out that when I said “fossil fuel subsidy”, I based that on the WTO definition of subsidies: “a subsidy shall be deemed to exist if...there is a financial contribution by a government or any [other] public body within the territory of a Member...where [it] involves a direct transfer of funds”, which includes removing a tax. That's why I called it a fossil fuel subsidy.
Farmers are, indeed, price-takers, but they also take prices on things like natural gas inputs. One of the things we've seen is that, since 2006, the price of natural gas has dropped rather precipitously in Canada, much to the detriment of gas-producing regions in Alberta and British Columbia, for instance. It's one of many inputs and, as my colleague at the Pembina Institute testified, assessments of the costs don't show that it would undermine the viability of farms, especially if appropriate supports are made.