Hundreds of millions could be
forced to go on the move because of water shortages and crop failures in most
of Africa, as well as in central and southern Asia and South America. There could also be an effect on levels of
starvation and on food prices as agriculture struggles to cope with growing
demand in increasingly arid conditions.
Rising sea levels could also
cause havoc, with coastal communities in southern Asia, the Far East, the south
Pacific islands and the Caribbean seeing their homes submerged. North and west Africans could head towards
Europe, while the southern border of the United States could come under renewed
pressure from Central America.
Craig Johnstone, the UNHCR deputy
high commissioner, said in a 2008 London conference that humanity faced a
"global-scale emergency" whose effects would accumulate over the next
four decades. He said it was impossible to forecast with confidence the numbers
of people who would lose their homes through climate change. But he pointed to
assessments of between 250 million and one billion people losing their homes by
2050. He said: "This will be a global-scale emergency, but . . . it will
take place gradually and over a long period of time." Mr Johnstone said: "It's the obligation
of the people who have the means to be helpful to help. They have an obligation
to humanity to help."
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