19 October 2015, The Conversation, The race to fish: how fishing subsidies are emptying our oceans. Fish numbers are rapidly dwindling globally, and fishery subsidies are one of the key drivers behind this decline. In 2009, these subsidies totalled about US$35 billion, creating incentives for fishers around the world to increase their catch. But this short-term “race to fish” is jeopardising the long-term environmental, social, and economic security that fisheries offer us all. My group at the University of British Columbia recently cast our net into the troubling waters of fishery subsidies, to see how this ship might be turned around. Overfishing: a major issue facing our oceans Fish numbers are rapidly dwindling globally, and fishery subsidies are one of the key drivers behind this decline. In 2009, these subsidies totalled about US$35 billion, creating incentives for fishers around the world to increase their catch. But this short-term “race to fish” is jeopardising the long-term environmental, social, and economic security that fisheries offer us all. My group at the University of British Columbia recently cast our net into the troubling waters of fishery subsidies, to see how this ship might be turned around. Overfishing: a major issue facing our oceans According to the recently released World Wildlife Fund Living Blue Planet Report, our oceans are in a bad state. Climate change, habitat destruction, and deep-sea mining are wreaking havoc on marine biodiversity. But overfishing is in a league of its own. The WWF report found that population numbers of utilised fish (those species used by humans for subsistence or commercial purposes) have fallen by half in the four decades from 1970 to 2010. A full 90% of fish stocks globally are now classified as either overexploited or fully exploited. Common seafood choices such as tuna, shrimp, whiting, and salmon are among the worst affected. According to the recently released World Wildlife Fund Living Blue Planet Report, our oceans are in a bad state. Climate change, habitat destruction, and deep-sea mining are wreaking havoc on marine biodiversity. But overfishing is in a league of its own. The WWF report found that population numbers of utilised fish (those species used by humans for subsistence or commercial purposes) have fallen by half in the four decades from 1970 to 2010. A full 90% of fish stocks globally are now classified as either overexploited or fully exploited. Common seafood choices such as tuna, shrimp, whiting, and salmon are among the worst affected. Read More here
Category Archives: Ecosystem Stress
18 October 2015, Climate News Network, Climate changes can kick in below 2°C limit. Sudden shifts in settled climates can occur long before global warming reaches the internationally-agreed safety level, European scientists say. Climate change could arrive with startling speed. New research has identified at least 37 “tipping points” that would serve as evidence that climate change has happened – and happened abruptly in one particular region. And 18 of them could happen even before the world warms by an average of 2°C, the proposed “safe limit” for global warming. Weather is what happens, climate is what people grow to expect from the weather. So climate change, driven by global warming as a consequence of rising carbon dioxide levels, in response to more than a century of fossil fuel combustion, could be – for many people – gradual, imperceptible and difficult to identify immediately. But Sybren Drijfhout, of the University of Southampton in the UK and his collaborators in France, the Netherlands and Germany, are not so sure. They report in the Proceedings of the National Academy of Sciences that they “screened” the massive ensemble of climate models that inform the most recent reports from the Intergovernmental Panel on Climate Change, and found evidence of abrupt regional changes in the ocean, the sea ice, the snow cover, the permafrost and in the terrestrial biosphere that could happen as average global temperatures reached a certain level. The models did not all simulate the same outcomes, but most of them did predict one or more abrupt regional shifts. No safe limit. But the future is not an exact science. “Our results show that the different state-of-the-art models agree that abrupt changes are likely, but that predicting when and where they will occur remains very difficult,” said Professor Drijfhout. “Also, our results show that no safe limit exists and that many abrupt shifts already occur for global warming levels much lower than two degrees.” The idea of a “tipping point” for climate change has been around for decades: the hypothesis is that a climate regime endures – perhaps with an increasing frequency of heat waves or windstorms or floods – as the average temperatures rise. However, at some point, there must be a dramatic shift to a new set of norms.Read More here
15 October 2015, The Conversation, Death of a landscape: why have thousands of trees dropped dead in New South Wales? Trees die – that’s a fact of life. But is the death of an entire iconic landscape of Eucalyptus in the Cooma-Monaro region of New South Wales natural? For over a decade, large stands of Eucalyptus viminalis, commonly known as Ribbon Gum or Manna Gum, have been gradually declining in health, and now stand like skeletons in huge tree graveyards. In our recently published survey we found the affected area to cover almost 2,000 square km, about the size of the area burnt in the devastating Ash Wednesday bushfires in Victoria or more than the area covered by the 2003 Canberra fires. Within this area, almost every Ribbon Gum is either dead or showing signs of severe stress and dieback, with thinning crowns full of dead branches. Other tree species seem to be surviving, but this smooth-barked gum with its characteristic ribbons of peeling park, once the dominant tree of the Monaro, now seems set to disappear from the landscape. Read More here
12 October 2015, Yale Environment 360, The Rapid and Startling Decline Of World’s Vast Boreal Forests. Scientists are becoming increasingly concerned about the fate of the huge boreal forest that spans from Scandinavia to northern Canada. Unprecedented warming in the region is jeopardizing the future of a critical ecosystem that makes up nearly a third of the earth’s forest cover. The boreal forest wraps around the globe at the top of the Northern Hemisphere in North America and Eurasia. Also known as taiga or snow forest, this landscape is characterized by its long, cold and snowy winters. In North America it extends from the Arctic Circle of northern Canada and Alaska down into the very northern tip of the United States in Idaho, Washington, Montana, and Minnesota. It’s the planet’s single largest biome and makes up 30 percent of the globe’s forest cover. Moose are the largest ungulate in the boreal, adapted with their long legs to wade in its abundant marshes, lakes and rivers eating willows, aspen and other plants. In the southern boreal forest of northern Minnesota, moose were once plentiful, but their population has plummeted. Thirty years ago, in the northwest part of the state, there were some 4,000; they now number about a hundred. In the northeast part, they have dropped from almost 9,000 to 4,300. They’ve fallen so far, so fast that some groups want them listed as endangered in the Midwest. Read More here