A specialist in physical geography says there is a link between climate change impacts and the severity of weather events like Cyclone Pam.However James Renwick from Victoria University's School of Geography, Environment and Earth Sciences says records do not show that extreme weather has become more frequent in the region over recent years.Nor is it expected to become more frequent in the near future.But Vanuatu's President Baldwin Lonsdale blamed climate change for the category five cyclone which has devastated his nation last week.Dr Renwick says there is a link because the greater severity of weather in the region is consistent with factors such as increased moisture in the atmosphere and warmer seas.\There's no actual sign of an increase in the numbers of tropical cyclones in the Pacific