The second is that there may have been back-migration into Africa to muddy the genetic water.
WSJ: Matt Ridley on Early Humans Leaving Africa | Mind & Matter
With the country set to celebrate its lunar new year festival in early February, companies have already started scaling back production and tens of millions of workers have begun their annual mass migration from their factories and city jobs back to their rural homes.
Ian O'Donnell, of University College Dublin, blames the increase on migration (labourers coming back from London), growing social inequality, and a rapid increase in beer consumption.
The country has a history of migration from North Africa going back to the early 20th century.
It's a reverse migration trend where people move back to India from overseas.
The Haitian diaspora has traditionally helped its Caribbean homeland recover from natural disasters, with large sums sent back to Haiti in remittances, the Migration Policy Institute says.
The phenomenon of Haitian migration in small boats and rafts dates back at least 35 years, according to a Congressional Research Service report.
Photography aided mass migration, as ordinary folks could leave something of themselves back in the old country, or send home a picture of themselves in their new and better lives.
In 2010, 34% of rural migrant workers left their factory jobs to move back home, according to the most recent data available from the Rural-Urban Migration in China and Indonesia project at Australian National University.
Jean-Philippe Chauzy, a spokesperson for the International Organization for Migration, says African countries with growing economies have the potential to attract skilled profs back home.
Mr Blunkett, seeking to seize the debate back, became the first home secretary in a long time to be absolutely unambiguous about what migration means to him.
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