The Greenhouse Effect is causing a general warming of the world. Climatologists are predicting that there will be more draughts and more floods. Soil erosion will also become an increasing problem in semi-arid lands. However, there will be benefits to other areas of the world where agricultural production will increase. An example is Hokkaido, the northern island of Japan, which will experience a temperature rise of 4 degrees Celsius within the next 50 years, and it is predicted that this will increase rice production fourfold, in Iceland and Finland, land fit for posture cold increase by 50% and yields of hay could increase by 60%.

Based on the above text, which of the following assumptions is correct in planning for future food production?