“I am in Tonga to issue a global SOS – Save Our Seas – on rising sea levels. A worldwide catastrophe is putting this Pacific paradise in peril” he said.

Sparsely populated and with few heavy industries, the Pacific islands collectively pump out less than 0.02 percent of global emissions every year.

But this vast arc of volcanic islands and low-lying coral atolls also inhabits a tropical corridor that is rapidly threatened by encroaching oceans.

The World Meterological Organisation has been monitoring tide gauges installed on the Pacific’s famed beaches since the early 1990s.

A new report released by the top UN climate monitoring body showed seas had risen by around 15 centimetres in some parts of the Pacific in the last 30 years.

The global average was 9.4 centimetres, according to the report.

“It is increasingly evident that we are fast running out of time to turn the tide,” said the forecasting agency’s top official Celeste Saulo.