If it seems to you that major humanitarian emergencies are happening more often, you're right. Extreme weather events like the one that devastated Vanuatu on Saturday are on the rise. Since 2000, the average number of climate-related disasters each year has been 44 per cent higher than between 1994 and 2000 and well over twice the level during the 1980s, a data-based managed by Brussels-based Centre for Research on the Epidemiology of Disasters shows.

United Nations Secretary-General Ban Ki-moon told a disaster risk reduction conference in Japan on Saturday that climate change is making extreme weather events the new normal.

A Nasa satellite image of cyclone Pam as the eye of the storm passes just east of Vanuatu. Credit:NASA

"Over the last two decades, more than four out of every five disasters were related to the climate change phenomenon," he said. "The economic toll is as high as $300 billion every year."

Developing countries are disproportionately affected – they account for about 95 per cent of all people killed by natural disasters – and once again small, vulnerable nations have been hit hardest. Cyclone Pam caused damage in Kiribati, Tuvalu and the Solomon Islands before tearing through Vanuatu.