Is being destroyed by political boundaries, and this is leading to desertification, particularly in sub-Saharan Africa. Intensive subsistence farming - Primarily Asia, rice is main crop. In more northern areas, like No. China, wheat is the main crop. Green Revolution - Use of new hybrids, fertilizer, pesticides to increase yields.
Problem is credit availability.
Often promoted poverty by concentrating ownership of land. India - Predominant smallholdings, credit problems, farms too small for mechanization. Unequal land distribution, tenant farming. Retreat from collectivization raised output. Food is expensive, farms are small and inefficient.