Because of the devastating impact of global warming as many as one billion people will lose their homes by 2050. Steady rise in temperatures across the planet might trigger mass migration on unprecedented levels.
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.
Climate change is the most serious long-term threat to development specially in poor countries, the effects of drought, flooding, food shortages and rising sea levels may lead them to make home in water.