Increasing cost of natural hazards as climate changes
Increasing cost of natural hazards as climate changes
07 November 2016
published by https://www.eurekalert.org
Australia A new comprehensive study of Australian natural hazards paints a picture of increasing heatwaves and extreme bushfires as this century progresses, but with much more uncertainty about the future of storms and rainfall.
Published today (Tuesday 8 November) in a special issue of the international journal Climatic Change, the study documents the historical record and projected change of seven natural hazards in Australia: flood; storms (including wind and hail); coastal extremes; drought; heatwave; bushfire; and frost.
“Temperature-related hazards, particularly heatwaves and bushfires, are increasing, and projections show a high level of agreement that we will continue to see these hazards become more extreme into the 21st century,” says special issue editor Associate Professor Seth Westra, Head of the Intelligent Water Decisions group at the University of Adelaide.
“Other hazards, particularly those related to storms and rainfall, are more ambiguous. Cyclones are projected to occur less frequently but when they do occur they may well be more intense. In terms of rainfall-induced floods we have conflicting lines of evidence with some analyses pointing to an increase into the future and others pointing to a decrease.
“One thing that became very clear is how much all these hazards are interconnected. For example drought leads to drying out of the land surface, which in turn can lead to increased risk of heat waves and bushfires, while also potentially leading to a decreased risk of flooding.”
The importance of interlinkages between climate extremes was also noted in the coastal extremes paper: “On the open coast, rising sea levels are increasing the flooding and erosion of storm-induced high waves and storm surges,” says CSIRO’s Dr Kathleen McInnes, the lead author of the coastal extremes paper. “However, in estuaries where considerable infrastructure resides, rainfall runoff adds to the complexity of extremes.”
This special issue represents a major collaboration of 47 scientists and eleven universities through the Australian Water and Energy Exchange Research Initiative, an Australian research community program. The report’s many authors were from the Centre of Excellence for Climate System Science, the CSIRO, Bureau of Meteorology, Australian National University, Curtin University, Monash University, University of Melbourne, University of Western Australia, University of Adelaide, University of Newcastle, University of New South Wales, University of Tasmania, University of Western Australia and University of Wollongong.
The analyses aim to disentangle the effects of climate variability and change on hazards from other factors such as deforestation, increased urbanisation, people living in more vulnerable areas, and higher values of infrastructure.
“The study documents our current understanding of the relationship between historical and possible future climatic change with the frequency and severity of Australian natural hazards,” says Associate Professor Westra.
“These hazards cause multiple impacts on humans and the environment and collectively account for 93% of Australian insured losses, and that does not even include drought losses.
“We need robust decision-making that considers the whole range of future scenarios and how our environment may evolve. The biggest risk from climate change is if we continue to plan as though there will be no change. One thing is certain: our environment will continue to change.”
Some of the key findings from the studies include:
Historical information on the most extreme bushfires – so-called “mega fires” – suggests an increased occurrence in recent decades with strong potential for them to increase in frequency in the future. Over the past decade major bushfires at the margins of Sydney, Canberra, and Melbourne have burnt more than a million hectares of forests and woodlands and resulted in the loss of more than 200 lives and 4000 homes.
Heatwaves are Australia’s most deadly natural hazard, causing 55% of all natural disaster related deaths and increasing trends in heatwave intensity, frequency and duration are projected to continue throughout the 21st century.
The costs of flooding have increased significantly in recent decades, but factors behind this increase include changes in reporting mechanisms, population, land-use, infrastructure as well as extreme rainfall events. The physical size of floods has either not changed at all, or even decreased in many parts of the country.
Government has urged Malawi Defence Force (MDF) soldiers who are deployed to guard Viphya Plantation against destruction to be vigilant by dealing with the perpetrators accordingly.
Msaka (left) walking in the plantantion
Minister of Mines, Energy and Natural Resources, Bright Msaka, made the statement Tuesday after touring the plantation, especially areas under the jurisdiction of Total Land Care and Raiply Malawi Limited.
Incidences of fire destroying numerous hectares of trees every year have been a never-ending song for the Viphya Plantation for over a decade now. The plantation is shared by two districts of Mzimba andNkhata Bay.
However, the issue has raged on in spite of efforts by government and its stakeholders to plant trees and guard them against destruction. Reports have indicated that more often, the fires that destroy the plantation are deliberately set rather than accidental.
The minister said government is aware that some disgruntled workers and individuals whose licences were cancelled are the ones setting fires in the plantation.
People need to know that this is a national asset, so if the department of forestry has denied somebody a licence for the reasons best known by the department, they are supposed to understand instead of setting fires, he said.
To mitigate the challenge, Msaka said government deployed MDF soldiers in protected forests across the country as a way of scaring people from destroying the plantations.
In spite of the effort, some people are still setting parts of the Viphya Forest on fire, regardless of the size of trees.
We have directed the Malawi Defence Force solders to deal with anyone setting bush fires and operating in the forest without licences and that the law will take its course [against them], he warned.
However, Msaka commended Raiply Malawi Limited and Total Land Care for utilizing the forest sustainably and adding value to the trees from the forest.
In the past, we have been cutting trees or sawing and selling them abroad at a very cheap price. We behaved like a prodigal son who squandered all what his father gave him.
We need to be very careful and be proud of what we inherited so that we can benefit from it and pass on those benefits to the next generation, advised the minister.
Earlier, Chief Executive Officer of Raiply Malawi Limited, Thomas Oomen, cited bush fires and encroachment as major challenges facing his company.
This year alone, we have lost about 526 hectares [of trees] to bush fires, unfortunately, most of these trees are below 15 years old but they are supposed to be harvested at the age of 25. This is dooming our future, said Oomen.
Chikangawa Forest consists of seven plantations comprising 53,000 hectares.
– See more at: http://www.nyasatimes.com/minister-msaka-warns-perpetrators-fire-viphya-forest/#sthash.5gaV0MIe.dpuf
