Heat is havoc for farmers — and the hardest-hit are in the world's poorest nations

In particular, Africa, home to the world's most meager economies, is suffering most.

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Of the world’s 35 poorest countries — as measured by World Bank data on GDP per capita — 30 are in Africa, with the average amount per person being less than $1,000 in the majority of that list. The most meager fi…