A survey of scientists researching in the sea level field - Expert assessment of sea-level rise by AD 2100 and AD 2300 - found that sea level rise is likely to be 70-120 centimeters by 2100 if greenhouse-gas emissions are not mitigated. A few like James Hansen think that it could be substantially higher.
The Postdam Institute for Climate Impact Research said in a media release:
The experts were also asked for a “high-end” estimate below which they expect sea-level to stay with 95 percent certainty until the year 2100. This high-end value is relevant for coastal planning. For unmitigated emissions, half of the experts (51%) gave 1.5 meters or more and a quarter (27%) 2 meters or more. The high-end value in the year 2300 was given as 4.0 meters or higher by the majority of experts (58%).
And yet here in Australia we see the Federal Government dropping the ball in co-ordinating coastal planning, and State Governments also withdrawing, leaving planning up to local Government which largely lacks the resources and cannot afford to carry the risk of inappropriate planning and development on our coasts. Queensland is just the latest Government to absolve itself of this planning responsibility.