'Katrina' sized storms could become more frequent

Storm surges on the same scale as Hurricane Katrina could become ten times more frequent with just a two degree rise in global temperatures, a study has found.

According to new research, a moderate climate change is likely to make extreme storm surges far more common than they are.

A rise in one degree creates a three to four-fold rate increase, meaning if temperatures rise by two degrees, extreme storm surges become ten times more common.

Until now, there has been a Katrina-magnitude storm surge roughly every 20 years since 1923.