Climate change threatens supplies of water for millions of people in poorer countries, warns a new report from the Christian development agency Tearfund.
Recent research suggests that by 2050, five times as much land is likely to be under "extreme" drought as now.Tearfund wants richer states to look at helping poorer ones adjust to drought at next month's UN climate summit.Areas where people are already on the move to avoid climate excesses include, the report says:
Brazil, where one in five people born in the arid northeast region relocates to avoid drought
China, where three provinces are seeing the spread of the Gobi desert
Nigeria, where about 2,000 sq km is becoming desert each year
Attributing the movement of people to climate impacts is, however, a difficult issue, with many other factors including economic opportunity behind decisions to relocate