[Viewpoint by Cecilia Tacoli, BBC News] Fears of millions of "climate refugees" crossing national borders are not supported by evidence on the ground, says Cecilia Tacoli. In this week's Green Room, she says we will fail to protect the world's most vulnerable people if misconceptions about migration continue to shape policies.

Search the internet for "migration" and "climate change" and you will find repeated warnings of a crisis in the making; of hundreds of millions of people on the move, of countries straining to cope with the pressure on their borders, and of national security under threat.

But these fears are based on many misconceptions about the duration, destination and composition of migrant flows. 

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