100 monkeys typing.

Swim, fishes.

Dear Senator Inhofe.

Could I interest you in some beach front property?

HOBART (Reuters) - Rising sea levels and melting polar ice-sheets are at upper limits of projections, leaving some human population centers already unable to cope, top world scientists say as they analyze latest satellite data.

A United Nations report by the Intergovernmental Panel on Climate Change (IPCC) in February projected sea level gains of 18-59 centimeters (7-23 inches) this century from temperature rises of 1.8-4.0 Celsius (3.2-7.8 Fahrenheit).

"Observations are in the very upper edge of the projections," leading Australian marine scientist John Church told Reuters.

"I feel that we're getting uncomfortably close to threshold," said Church, of Australia's CSIRO Marine and Atmospheric Research said.

(...)

The break-up of ice in Antarctica to create icebergs is also opening pathways for accelerated flows to the sea by glaciers.

Church pointed out that sea levels were 4-6 meters higher more than 100,000 years ago when temperatures were at levels expected to be reached at the end of this century.

Dynamic ice-flows could add 25 percent to IPCC forecasts of sea level rise, van Ommen said.

Australian scientist John Hunter, who has focused on historical sea level information, said that to keep the sea water out, communities would need to begin raising sea walls.

"There's lots of places where you can't do that and where you'll have to put up with actual flooding," he said.