The lead research economist at the World Bank, Branko Milanovic, will be reporting soon, in the journal Global Policy, the first calculation of global income-inequality, and he has found that the top 8% of global earners are drawing 50% of all of this planet’s income. He notes: ‘Global inequality is much greater than inequality within any individual country,’ because the stark inequality between countries adds to the inequality within any one of them, and because most people live in extremely poor countries, largely the nations within three thousand miles of the Equator, where it’s already too hot, even without the global warming that scientists say will heat the world much more from now on.

For example, the World Bank’s list of ‘GDP per capita (current US$)’ shows that in 2011 this annual-income figure ranged from $231 in Democratic Republic of Congo at the Equator, to $171,465 in Monaco within Europe. The second-poorest and second-richest countries respectively were $271 in Burundi at the Equator, and $114,232 in Luxembourg within Europe. For comparisons, the U.S. was $48,112, and China was $5,445. Those few examples indicate how widely per-capita income ranges between nations, and how more heat means more poverty.

Wealth-inequality is always far higher […]