Expert says rising sea levels pose threat to rice crops
Pastor Dale Morgan
Expert says rising sea levels pose threat to rice crops*
MANILA, July 9 (AFP) Jul 09, 2007
Rising sea levels triggered by climate change pose an "ominous" threat
to some of the world's most productive rice-growing areas, the
International Rice Research Institute has warned.
The Philippines-based institution is devoting fresh efforts to
mitigating the coming threat, but senior climate scientist Reiner
Wassman said adequate funding had yet to materialise.
"Some of Asia's most important rice-growing areas are located in
low-lying deltas, which play a vital role in regional food security and
supplying export markets," Wassman told the IRRI magazine Rice Today.
"With Vietnam so dependent on rice grown in and around low-lying river
deltas, the implications of a sea-level rise are ominous indeed."
Rice is the staple cereal of nearly half the world's 6.6 billion people.
Wassman said the impact of global warming on the key cereal would depend
on the patterns of change in rice-growing regions.
But he warned a threatened rise of between 10 and 85 centimetres (four
to 34 inches) in sea levels over the next century could have "enormous"
impacts on some countries, including key rice exporter Vietnam.
IRRI is cooperating with Hanoi to assess the impact of sea-level rise
scenarios in the Mekong delta, he said.
The organisation this year launched a project to assess the possible
impact of climate change on rice output and find ways of adapting
rice-growing to the new realities of global warming.
He said higher temperatures could decrease rice yields, and that the
organisation would initially focus on improving the resilience of rice
to heat through research on plant physiology.
Aside from the sea-level rise threat to areas such as the Mekong delta,
Wassman said more frequent or more intense droughts, cyclones and heat
waves posed "incalculable threats to agricultural production."
But he said the IRRI was optimistic it would be able to develop new
varieties that could cope with higher temperatures.
Scientists are also confident that the resilience of rice production
systems to climate extremes, such as floods and droughts, can be
improved, he said.
However, he warned it was unclear to what extent the impact of higher
sea levels could be compensated for, and what the costs and
socioeconomic consequences of any such changes would be.
The magazine said an increase in carbon dioxide concentration could
actually improve rice yields.
However, funding constraints have prevented scientists from studying the
issue under realistic conditions even though the technology is now
available, it said.