Climate Change Induced "ecomigrants?"

The Washington Post reports that more and more people are moving in search of more inhabitable space:

There were about 25 million ecomigrants in the world a little more than a decade ago, said Norman Myers, a respected British environmental researcher at Oxford University. That number is now "a good deal higher," he added. "It's plain that sea-level rise in the wake of climate change will inundate the homelands of huge numbers of people."

In Bangladesh, about 12 million to 17 million people have fled their homes in recent decades because of environmental disasters -- and the low-lying country is likely to experience more intense flooding in the future. In several countries in Africa's Sahel region, bordering the Sahara, about 10 million people have been driven to move by droughts and famines.

A variety of forecasts suggest that environmental disasters are likely to grow in number and intensity in coming decades. Conflicts and war often follow migrations of large numbers of people across international borders

Yet some are skeptical of this article, saying that there needs to be a better definition of "ecomigrant." I am not sure whether Jack Shafer makes a convincing argument against the increasingly alarming number of people threatened by climate induced changes.