As rising gold prices fuel environmental destruction, communities in the country’s biodiverse heartland are passing laws against mining As rising gold prices fuel environmental destruction, communities in the country’s biodiverse heartland are passing laws against mining M ahogany trees tower above Herminio Mamani as he tends his cacao farm in Bolivia ’s biodiverse north-west. A former president of El Ceibo , the country’s largest organic cacao co-operative, he says the agroforestry model used