Category Archives: Ecosystem Stress

PLEA Network

22 June 2015, The Carbon Brief, Climate change attribution studies are asking the wrong questions, study says. Scientists are calling for a rethink in the way we seek to understand how climate change affects extreme weather. The latest in so-called attribution studies is to study each individual event by itself, looking for how climate change may have made it stronger or more likely. But a new paper says the methods used in many of these studies underestimate the influence of climate change, and suggests a new approach to identify the “true likelihood of human influence”.

One of the first studies to attribute a single extreme weather event to climate change was published just over a decade ago. Researchers showed that climate change had doubled the chances of the record heatwave Europe experienced in 2003. In the years that followed, many more studies have aimed to provide answers on how climate change is affecting our most brutal weather. But while scientists have been able to attribute events caused by temperature extremes, linking other extreme events like storms and heavy rainfall events has proved more difficult, says a new paper in Nature Climate Change. Read More here

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22 June 2015, The Conversation, Climate: the elephant in the room for developing northern Australia: The recently released white paper on developing northern Australia ignores an elephant in the room: climate change. While the paper sees a bright future for the north (roads, rail, dams and food), without considering climate change we can’t be sure the north will even be liveable. The white paper also fails to take into account other environmental constraints such as water and soils….. The white paper has not referenced high-quality expert advice prepared by the Northern Australian Land and Water Task Force…. The white paper ignores reference to sophisticated climate change projections for northern Australia developed by our own CSIRO and Bureau of Meteorology. Climate projections for the north this century paint a dire future and bring into question the feasibility and affordability of many of the development policies, plans and projects outlined in the white paper. Read More here

 

PLEA Network

4 June 2015, Timberbiz, RET could revive timber in Victoria. The revised Renewable Energy Target (RET) currently before Parliament would provide a market for otherwise unsaleable timber, according to a document from Victoria’s state-owned forestry business, VicForests, obtained by the ABC. Source: ABC News. Environment Minister Greg Hunt introduced the Renewable Energy (Electricity) Amendment Bill and the legislation locks in the bipartisan deal for a new, lower, 2020 Renewable Energy Target. But, controversially, it reinstates the burning of native forest wood waste as a renewable energy source in the RET scheme. “There is no evidence that its eligibility leads to unsustainable practices or has a negative impact on Australia’s biodiversity,” Mr Hunt said when introducing the bill. “Using wood waste for generation is more beneficial to the environment than burning waste alone on the forest floor or simply allowing it to decompose and to produce methane a very high global warming potential gas.” The changes will help hardwood timber company Australian Solar Timbers (AST) build a two-megawatt power plant that will generate electricity onsite. AST chairman Douglas Head said timber for the plant in New South Wales’ Macleay Valley would come from existing sawmill waste that had little current value. “There is not one new tree that would be cut. Frankly you would not cut a tree to produce electricity alone. It’s got to be cut for some other high-value use,” he said. He said the wood by-products now potentially eligible for burning were “used sometimes as boiler fuels, potting mix, horse stable coverings and in the chicken industry — very low value”. The VicForests document says wood could be used as a brown coal substitute, but Nathan Trushell from VicForests downplayed the prospect of massive forest furnaces. “I think the stark reality for us is we would see some significant economic challenges with Renewable Energy Target credits or not,” he said. “I think if there is opportunity for us in that space, it’s really around small-scale local generation. I think for large-scale co-generation in coal-fired power stations the reality is timber is heavy and expensive to transport. “If we’re looking at our operations in East Gippsland we’re talking about several hundred kilometres to transport that material. I can’t see how economically that would stack up for us. Read More here

PLEA Network

2 June 2015, Climate News Network, Glacier loss raises high concern over water supplies: The glaciers of the Everest region of the Himalayan massif—home to the highest peak of all—could lose between 70% and 99% of their volume as a result of global warming. Asia’s mountain ranges contain the greatest thickness of ice beyond the polar regions. But new research predicts that, by 2100, the world’s highest waters—on which billions of people depend for their water supply—could be at their lowest ebb because of the ice loss. Many of the continent’s great rivers begin up in the snows, fed by melting ice in high-peak regions such as the Hindu Kush, the Pamir and the Himalayas. Joseph Shea, a glacial hydrologist at the International Centre for Integrated Mountain Development in Kathmandu, Nepal, and French and Dutch colleagues report in The Cryosphere journal that they used more than 50 years of climate data and sophisticated computer models of predicted climate change to study the pattern of snowpack and seasonal melt in the Everest region. Read More here