<Cuba has a 99.8% literacy rate,[3][15] an infant death rate lower than some developed countries,[16] and an average life expectancy of 77.64.[3] In 2006, Cuba was the only nation in the world which met the WWF's definition of sustainable development; having an ecological footprint of less than 1.8 hectares per capita and a Human Development Index of over 0.8 for 2007.>
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