We have seen that cool summer damage can have a significant impact on Japanese rice production, especially in the northern regions of Hokkaido and Tohoku, which produce more than a third of the national output. In this section we use a dynamic model to simulate the growth and yield of the rice crop in Hokkaido under some of the climatic scenarios described in Section 2. Results from these experiments will subsequently be used to substantiate further experimental results in the next section of this report.