Answer:
Doubling the area of arable land on a global basis
Explanation:
Here, the least viable option or strategy has been asked. Doubling the area of arable land on a global basis is the least viable option because it is quite impossible in the given circumstances. At the moment, year by year, the arable land on planet earth is actually decreasing due to the aggressive agricultural techniques and chemical usage for harnessing more output has contaminated the top soil in many regions. This means that the crop output and the arable land both are decreasing. Also, floods and other natural disasters affect or decrease arable land as well. Hence, doubling the current arable land 1.5 billion hectares globally which is 11% of the globe is pretty impossible in the current situation.