11 November 2016, The Conversation, Firestorms: the bushfire/thunderstorm hybrids we urgently need to understand. Fire has been a driving force across Australia for millennia. Indeed, the health of many of our ecosystems is intrinsically dependent on fire. But bushfires are also one of our most frequent natural hazards, with a total cost estimated at A$340 million per year. In the past decade or so, extreme bushfires in southeastern Australia have burned more than a million hectares, claiming more than 200 lives and over 4,000 homes. Similar losses in other major urban areas have prompted questions about whether we are seeing a shift towards a significantly more hazardous fire regime, characterised by increasing fire frequency and intensity, and the development of catastrophic “firestorms”. While these extreme bushfires account for only a very small percentage of fire events, they are responsible for the lion’s share of bushfire-related losses. In contrast to typical bushfires, which spread across the landscape as well-defined burning fronts with smoke plumes perhaps a few kilometres high, extreme bushfires exhibit deep and widespread flaming and produce smoke plumes that can extend 10-15km into the atmosphere. At these altitudes, bushfire plumes can actually develop into thunderstorms (hence the term “firestorm”). As such, extreme bushfires become much more difficult for emergency services to handle, making them all but impossible to suppress and their spread difficult to predict. Read More here
Category Archives: Building Resilience
20 July 2016, Renew Economy, ACT opens solar scheme to low-income households. The ACT’s $2 million low-income solar scheme has opened for registrations of interest from eligible households, wishing to install rooftop PV but unable to afford the upfront investment. ACT environment minister Simon Corbell said on Wednesday that people living in low-income households in the Territory could now put their hands up to take part in the pilot program, which will run for the next four years. The program, which is expected to start installing systems in late 2016 or early 2017, will be run as a pilot, initially, to determine the best approach for future delivery, and will be developed in conjunction with key stakeholders including ACT Housing, community welfare organisations, and low-income loan groups. The opening of the renewables scheme – one of many being successfully rolled out in the ACT – comes at a time where rooftop solar and wind energy are being accused of driving up power prices in some parts of Australia. But as we have noted on various separate occasions, the accusations, coming mainly from conservative politicians and media outlets, are ill-informed and misdirected, and ignore the many benefits solar and wind have brought to the national electricity market. ACT’s Corbell, who is the mastermind behind the territory’s ambitious 100 per cent renewable energy target, has demonstrated these benefits very well, and is poised to deliver massive savings to consumers in the nation’s capital, as this article explains. Read More here
12 July 2016, Renew Economy, ACT could make windfall gains from bold 100% renewables target Who is the smartest energy minister in the country? At the moment, you would have to say it was the ACT’s Simon Corbell, the mastermind behind the territory’s bold 100 per cent renewable energy target, and who is poised to deliver massive savings to consumers in the nation’s capital. Indeed, if current wholesale electricity prices continue as they are across Australia, the ACT will not just have zero emissions electricity by 2020, it may also be getting most of it for free. This extraordinary situation arises out of the nature of the contracts that the ACT government has written with the project developers who have won its unique reverse auction tenders. The ACT has locked in fixed prices at between $77/MWh and $92/MWh for a total of 400MW of wind energy capacity so far. If the wholesale price is below those contracts, the ACT government pays the difference. If it is above, the ACT electricity utility ActewAGL receives the excess. In the past two months, wholesale prices across Australia have gone through the roof, mostly because of soaring gas prices (at record levels in most states), and supply constraints. Some of these rises have already been passed on to consumers. The first of the ACT commissioned wind farms, the 19MW Coonooer Bridge project in Victoria, opened earlier this year and gets a guaranteed $81.50/MWh from the ACT. But prices in Victoria have regularly jumped above $100/MWh in the past two months. Read More here
5 June 2016, Climate News Network, Europe’s floods come as no surprise. Scientists have warned that the extra moisture in warmer air will mean more intense rainfall, but floods still leave governments unprepared. At least 18 people have lost their lives in central Europe as severe floods engulf the continent from France to Ukraine. In Paris the River Seine reached 6.1 metres (20 feet) above normal, and tens of thousands of people have fled their homes. If the downpours and swollen rivers came as a surprise, they shouldn’t have done. Not only are there historical precedents for disastrous floods. There have beengraphic recent warnings too, spelling out the growing likelihood that the warming climate will make bouts of flooding and other extreme weather more frequent. Last March a study reported in the journal Nature said climate change was already driving an increase in extremes of rainfall and snowfall across most of the globe, even in arid regions. The study said the trend would continue as the world warmed. The role of global warming in unusually large rainfall events in countries from the United Kingdom to China has been hotly debated. But this latest study showed that climate change is driving an overall increase in rainfall extremes. Its lead author, Markus Donat, a climate scientist at the University of New South Wales in Australia, said: “In both wet and dry regions, we see these significant and robust increases in heavy precipitation.” “It is probably a good idea to invest in infrastructure that helps in dealing with heavier precipitation” Warm air holds more moisture, and global warming is already increasing the odds of extreme rainfall. “The paper is convincing and provides some useful insights,” said Sonia Seneviratne, a climate scientist at the Swiss Federal Institute of Technology. “What is particularly new in this article is the demonstration of such a signal for observed changes in dry regions.” Read More here