The economic gap between the richest and poorest nations, in terms of per capita income, is now about 25 percent larger than it would have been without human-caused climate change. Tropical countries tend to contribute far less to greenhouse gas emissions than more economically well-off nations.

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The economic gap between the richest and poorest nations, in terms of per capita income, is now about 25 percent larger than it would have been without human-caused climate change. Tropical countries tend to contribute far less to greenhouse gas emissions than more economically well-off nations.