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The Serengeti looks largely like it did hundreds of years ago.

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Agriculture involves a difficult balance between food production and environmental impact. For example, fertilisers can help to achieve good crop yields, but over-using them produces greenhouse gas emissions and pollution.

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Dr Mmatlou Kalaba’s International Fresh Produce Association Cape Town conference presentation on the as yet little-understood Africa-wide free trade system drew much interest, coming as it did in the same week that Botswana’s closure of its borders to South African vegetables (a practice also followed by fellow Southern African Customs Union member Namibia to protect its domestic industry) made national headlines.

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Between now and 2040, almost every second person born worldwide will be African, and the continent will account for more than 60% of growth in the world’s working-age population. Africa has boundless potential. And yet the income gap between Africa and the rest of the world has been growing since the 1960s.