Helping to build a barrier around a primary forest in the centre of Ivory Coast’s Abidjan, Victor is happy to protect the endangered green space from the expanding city. “We have our own Great Wall of China,” says the construction worker proudly. In three months’ time, a cinder block fence 10 kilometres (six miles) long is to run along the edge of the Banco National Park to prevent it from being swallowed up by neighbouring districts. Along with the Tijuca park in Brazil’s Rio de Janeiro, the nature reserve is one of just two virgin forests worldwide to have survived at the heart of a metropol…

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