Ehrhart said the breakdown of ecosystem-dependent livelihoods is likely to remain the main driver of forced migration during the next few decades.

CNN: Climate change may displace up to 200 million

At the same time, a huge wave of forced migration went in the other direction: Muslims from the city and its environs were being shipped away to Turkey, under a Greek-Turkish (or more precisely Christian-Muslim) exchange which made both countries ethnically much more homogeneous.

ECONOMIST: Religious tolerance

"Climigration" refers to the forced and permanent migration of communities because of severe climate change effects on essential infrastructure.

CNN: 'Climate change' forces Eskimos to abandon village

Pew estimates that net migration -- newly arrived immigrants minus those leaving (forced or voluntarily) -- has come to a standstill, which it attributes to the weakened U.S. job and construction markets, border enforcement, an increase in deportations, and increased dangers associated with crossing the border.

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The current migration represents income investors migrating into the stock market out of desperation, many have essentially been forced into it.

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