Uriel Sinai/Getty Images

Global climate change will create one billion refugees by 2050, according to a report released today. The paper, written by charity organization Christian Aid, assumes that the world will heat up by between 1.8 and 3.0 degrees Celsius over that time, giving rise to apocalyptic floods and famines that will starve and displace millions. The result? "A world of many more Darfurs," as refugees are caught between devastated homes and hostile populations elsewhere who have no desire to share precious resources.

These internally displaced persons, or IDPs, have no rights under international law and no official voice .... Their living conditions are likely to be desperate and in many cases their lives will be in danger."

The prospect of multiple Darfurs is horrifying. But if Christian Aid think this is a call to action, they're dreaming. We all know what's happening in Darfur. Thus far the response from the West has been precisely zero. And no matter what you multiply zero by, the answer is always the same. The sad fact is that for all the hot air exhaled about climate change, it is little more today than global debt relief was two years ago—a platform to help politicians appear sensitive. Only when the consequences of global warming pinch the world's middle classes will action be taken. By then, I'm sorry to say, it could be too late for the IDPs.