When I worked on a BBC series, ‘Africa’ with Sir David Attenborough, my favourite filming location was the Okavango Delta, the so-called jewel of the Kalahari. Pristine waters studded with tiny islands, surrounded vast open savannahs supporting herds and their predators, all under the African skies. This emerald oasis is surrounded by a great desert, cut off from the real world. It seemed to me to be a self-sustaining Eden, thriving in isolation, dependent only on an influx of water and su…
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