Migration and climate change: A new (under) class of travellers

The International Organisation for Migration thinks there will be 200m climate-change migrants by 2050, when the world’s population is set to peak at 9 billion. Others put the total at 700m.

These startling numbers may conjure up a picture of huge, desperate masses, trekking long distances and if necessary overrunning border defences because their homelands have dried up or been submerged. But at least initially, the situation in Kenya and other parts of east Africa is likely to be more typical: an already poor population whose perpetual search for adequate pasture and shelter grows harder and harder.
In such conditions, local disputes—even relatively petty ones between clans and extended families—can easily worsen, and become embroiled in broader religious or political fights. And that in turn makes it harder for everybody in the area to survive, and more desperate to find new places to live, even if they are not far away.

A new report—“In Search of Shelter”—by the United Nations University, the charity CARE and Columbia University in New York lists the eco-migration “hot spots”: dry bits of Africa; river systems in Asia; the interior and coast of Mexico and the Caribbean; and low islands in the Indian and Pacific Oceans.

A one-metre rise in sea levels could displace 24m people along the Ganges, Brahmaputra, Irrawaddy, Salween, Mekong, Yangtze and Yellow rivers—which together support a quarter of humanity. A two-metre rise could uproot 14m people on the Mekong alone and swamp much of its farmland. Meanwhile, the melting of the Himalayan glacier will cause floods and erosion upstream, boosting the price of rice and other staples. And many regional conflicts could be exacerbated.

The scale of the likely population shift raises big questions. Will climate-change migrants be recognised? The classic definition of refugees—tossed between states by war or tyranny—is outdated. Eco-migrants will be paperless paupers, whose multiple woes are hard to disentangle.

The Economist