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Global warming has caused the Indian economy to be 31 per cent smaller than it would otherwise have been, according to a Stanford study which shows how Earth’s temperature changes have increased inequalities. The study, published in the journal Proceedings of the National Academy of Sciences, showed that growing concentrations of greenhouse gases in Earth’s atmosphere since 1960s have enriched cool countries like Norway and Sweden, while dragging down economic growth in warm countries such as India and Nigeria. The study from 1961 to 2010, global warming decreased the wealth per person in the world’s poorest countries by 17 to 30 per cent. Meanwhile, the gap between the group of nations with the highest and lowest economic output per person is now approximately 25 per cent larger than it would have been without climate change.