Just to provide the numbers: in 2030, a tax will be introduced of 120 DKK (~16€) / ton CO2e, which linearly increases each year until it reaches 300 DKK (~40€) / ton CO2e in 2035. However, the farmers can get subsidies for changing their practices and adopting new technologies, in order to reduce their emissions. I.e., the government will give you money to change your production, so you can minimize the carbon taxes you have to pay. There are more technicalities to how it works, but that's the gist of it. The important part is that the goal is to transition to new technologies and production methods, which reduces emissions per unit food produced.

There will be no food subsidy, however, and a rough estimate of the increase of food cost is something like 1.5%, with beef having the highest increase. Take this estimate with a grain of salt though, as it's difficult to estimate. An increase in food cost is expected though.