It would be preferable for me to answer you in English. I hope I clearly understood your question.
Agriculture is actually a very difficult case for knowing what the impact is going to be. I've seen estimates on both one side and the other. It really depends on where you are. Canada is a large country with tremendous possibilities, adaptive possibilities. If you can't grow something here, then you perhaps can grow it in other parts of the country, and if you can't grow this crop, then you perhaps can grow a different crop.
Without giving a long answer, it seems that for North America, up to a global mean average temperature increase of two degrees, there probably could be net benefits. If you go past that, everything then starts going downhill. I'm sure you understand. With warmer temperatures, you have a longer growing season. You have more CO2 in the atmosphere, and that's a natural fertilizer. There's the problem of whether we're going to have enough water, necessarily, and that's a big question. But the adaptive capacities of agriculture in Canada, in North America, are quite significant, so there really is a question of whether the impact will be negative or positive, and when.
I can't be more precise, I think, than that at the moment.