What might be a possible effect of Canada having less arable land than the USA?

Arable land (from Latin arabilis, "able to be plowed") is, according to one definition, land capable of being ploughed and used to grow crops.[1] In Britain, it was traditionally contrasted with pasturable lands such as heaths which could be used for sheep-rearing but not farmland.

This could be bad because Canada will have less crops which would could mean less grains. This is a problem because people need crops to survive.