For several years, insuring harvests against the climate hazards that regularly destroy farmers’ crops in developing countries has for several years been a major tool in the fight against poverty, mainly in Africa and Asia, where between 400 and 500 million farmers survive on very low incomes. This system, which links indemnities to a climate index, allows small family businesses to insure their harvests, at least partially, against catastrophic losses that could otherwise ruin them.