Author Archives: hmcadmin

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28 January 2016, Science Daily, Intact nature offers best defense against climate change. Worldwide responses to climate change could leave people worse off in the future according to a recent study conducted by CSIRO, Wildlife Conservation Society (WCS) and the University of Queensland. The paper, “Intact ecosystems provide the best defense against climate change,” published in Nature Climate Change, discusses how certain adaptation strategies may have a negative impact on nature which in turn will impact people in the long-term. “In response to climate change, many local communities around the world are rapidly adjusting their livelihood practices to cope with climate change, sometimes with catastrophic implications for nature,” according to CSIRO’s principal research scientist Dr. Tara Martin. The authors say that in Australia and Canada, conservation reserves are being used as drought relief to feed livestock, while forests in the Congo Basin in Africa are being cleared for agriculture in response to drought, and coral reefs are being destroyed to build sea walls from the low-lying islands in Melanesia. Dr. Martin added: “These are just few of the human responses to climate change that, if left unchallenged, may leave us worse off in the future due to their impacts on nature. Functioning and intact, forests, grasslands, wetlands and coral reefs represent our greatest protection against floods and storms.” The paper states that intact native forests have been shown to reduce the frequency and severity of floods, while coral reefs can reduce wave energy by an average of 97 per cent, providing a more cost-effective defense from storm surges than engineered structures. Read More here

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25 January 2016, Renew Economy, Tasmania grid struggles with drought, bushfires, lost connection. Tasmania’s electricity grid is facing its biggest challenge in years, with its hydro storage about to fall to its lowest levels ever, bushfires forcing the closure of some power facilities, and a faulty cable cutting the connection between the island and the country’s main electricity grid. The Apple Isle’s main source of electricity – hydro power – is being challenged by its driest ever spring, pushing reserves down to just 18.9 per cent. The lowest level ever is 16.5 per cent, reached in 2007, but overall storage levels are predicted to fall to a low of 14 per cent by the end of March – if normal rainfall patterns resume. At current rates, however, some fear they may fall below those levels, although there has been some light rain in recent days. To make matters worse, the Basslink cable linking the island’s grid to the mainland has been cut by technical problems, and will probably remain closed for another two months, while the raging bushfires have threatened power lines and forced the temporary closure of at least four hydro plants. “These circumstances are extraordinary and unprecedented,” Premier Will Hodgman and energy minister Matthew Groom said in a joint statement late last week. “It will be tough, but we will get through it.” To address the issue, the government has had to bring its Tamar Valley gas power generator – scheduled for permanent closure last year – out of mothballs. That has provided 280MW of added capacity, but the government is now looking to bring another 105MW of gas and diesel power back into the system to hedge against further depletion of its hydro resources. Read More here

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25 January 2016, The Guardian. Sea level rise from ocean warming underestimated, scientists say. Thermal expansion of the oceans as they warm is likely to be twice as large as previously thought, according to German researchers. The amount of sea level rise that comes from the oceans warming and expanding has been underestimated, and could be about twice as much as previously calculated, German researchers have said. The findings in the Proceedings of the National Academy of Sciences, a peer-reviewed US journal, suggest that increasingly severe storm surges could be anticipated as a result. Sea level can mount due to two factors – melting ice and the thermal expansion of water as it warms. Until now, researchers have believed the oceans rose between 0.7 to 1mm per year due to thermal expansion. But a fresh look at the latest satellite data from 2002 to 2014 shows the seas are expanding about 1.4mm a year, said the study. “To date, we have underestimated how much the heat-related expansion of the water mass in the oceans contributes to a global rise in sea level,” said co-author Jurgen Kusche, a professor at the University of Bonn. The overall sea level rise rate is about 2.74mm per year, combining both thermal expansion and melting ice. Read More here

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25 January 2016, New Scientist, US east coast snowstorms linked to slowdown of Atlantic current. The record snowfall that paralysed much of the east coast of the US on the weekend could be partly due to a slowing of the Atlantic currents that transport heat northwards towards Greenland and Europe. Winter storms like Jonas, as some are calling it, are caused when cold air from Canada collides with warm, moist air flowing up from the tropical Atlantic. Because the waters off the east coast are much warmer than normal for this time of year, the winds blowing onshore carried more moisture than usual, which is why the snowfalls were so high – breaking records in several places. New York’s JFK airport recorded 77 centimetres on 23 January, for instance, the most ever recorded on a single day. Nearly 30 deaths have been blamed on the storm, from car accidents to heart attacks while shovelling snow. Flooding risk The remnants of Jonas are now heading across the Atlantic to the UK, where it is feared they will cause yet more flooding. Global warming is the obvious explanation for the unusual warmth, and computer models are likely to show that storm Jonas was made much more likely because of climate change.The El Niño that helped push global temperatures to record-smashing levels last year may also have played a part. But there may be more to it. Read More here