CUBA is the most sustainably developed country in the world, according to a new report launched today. The socialist island outperforms advanced capitalist countries including Britain and the United States, which has subjected Cuba to a punitive six-decades-long economic blockade. The Sustainable Development Index (SDI), designed by anthropologist and author Dr Jason Hickel, calculates its results by dividing a nation’s “human development” score, obtained by looking at statistics on life expectancy, health and education, by its “ecological overshoot,” the extent to which the per capita carbon footprint exceeds Earth’s natural limits.