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It’s not every day that I feel the need to fight with Martin Wolf. The Financial Times commentator is an eminently respectable analyst and most of the time makes good sense. However, last week he sort of lost the plot. Wolf has written that technology will do to finance

South Africa has made domestic and international commitments to climate change mitigation. But the country continues to depend on coal-fired power plants, which provide 92% of its electricity. A key challenge for the country in dealing with electricity shortages is