A sea of trouble for Asia by 2070

Sydney: Millions of people could become homeless in the Asia-Pacific region by 2070 due to rising sea levels, with Bangladesh, India, Vietnam, China and Pacific islands most at risk, says Australia's top scientific body.

A climate change report by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) found global warming in the Asia Pacific region could cause sea levels to rise by up to 16 centimetre by 2030 and up to 50 centimetre by 2070.

Rising temperatures will also result in increased rainfall during the summer monsoon season in Asia and could cause more intense tropical storms, inundating low-lying coastal villages.

''The coastlines of Asia-Pacific nations are generally highly vulnerable to the effects of climate change, particularly sea-level rise caused by rising global temperatures,'' said the CSIRO report.

''Vast areas of the Asia-Pacific are low lying, particularly the small-island states, as well as the large river deltas found in India and Bangladesh, Southeast Asia and China,'' it said.

Sea level rise between 30 to 50 centimetre would affect more than 100,000 kilometre of coast, particularly China's Pearl Delta and Bangladesh's delta, said the report.

''As sea level rise exceeds half a metre, the area affected in the Asia-Pacific region rises to over half a million square kilometre, affecting hundreds of millions of people,'' it said.

The report also said rising sea levels and increased rainfall would spread infectious diseases in the region, leaving millions more at risk of dengue fever and malaria.

It said local and regional economies would be hard hit by chronic food and water insecurity, warning Sri Lanka's GDP could fall by 2.4 per cent with less than a two degree Celsius warming.

The report also warned of environmental refugees fleeing their flooded homelands, citing growing migration from some South Pacific island states already suffering rising sea levels.

Some 17,000 islanders applied for New Zealand residence in the last two years, compared with 4,000 in 2003, it said.

The low-lying South Pacific island nation of Micronesia has experienced an annual sea level rise of 21.4 millimetre since 2001.