15 February 2016, Science Daily, Four billion people affected by severe water scarcity. There are four billion people worldwide who are affected by severe water scarcity for at least one month a year. That is the conclusion of University of Twente Professor of Water Management, Arjen Hoekstra, after many years’ extensive research. This alarming figure is much higher than was previously thought. His ground-breaking research was published in Science Advances. Professor Hoekstra’s team is the first research group in the world to identify people’s water footprint from month to month and to compare it to the monthly availability of water. “Up to now, this type of research concentrated solely on the scarcity of water on an annual basis, and had only been carried out in the largest river basins,” says Hoekstra. He defines severe water scarcity as the depletion of water in a certain area. “Groundwater levels are falling, lakes are drying up, less water is flowing in rivers, and water supplies for industry and farmers are threatened. In this research, we established the maximum sustainable ‘water footprint’ for every location on earth, and then looked at actual water consumption. If the latter is much greater than what is sustainable, then there can be said to be severe water scarcity.” More than previously thought Until now, it had always been assumed in the scientific community that 2 to 3 billion people were affected by severe water scarcity. “Previous research looked at the availability of water on an annual basis, but that paints a more rosy and misleading picture, because water scarcity occurs during the dry period of the year,” explains Hoekstra. In his research, he describes for each place the number of months in a year that people are affected by severe water scarcity. That varies from zero to twelve months per year. Problem areas Of the four billion people referred to, a large proportion feel the effects of water scarcity directly. Particularly in Mexico, the western US, northern and southern Africa, southern Europe, the Middle East, India, China, and Australia, households, industries and farmers regularly experience water shortages. In other areas, water supplies are still fine but at risk in the long-term. Read More here
Tag Archives: Extreme Events
8 February 2016, Climate Home, US military to war game climate change threats. US military planners have been ordered to war game climate change scenarios, focusing on “geopolitical and socioeconomic instability” linked to extreme weather. A new directive says forces need to undertake joint training exercises with allies to “enhance capacity” and “improve tactics” for tackling impacts linked to global warming. “Mission planning and execution must include identification and assessment of the effects of climate change on the DoD [department of defence] mission,” it reads. Under DOD DIRECTIVE 4715.21 chiefs of staff, equipment buyers and health advisers will need to integrate climate change into any new purchases, missions or infrastructure plans. The document, which is signed off by Robert Work, deputy secretary of Defense, calls for greater work with climate scientists to “reduce risk and promote mission execution.” Planners must “integrate climate change considerations into mission area analyses and acquisition strategies across the life cycle of weapons systems, platforms, and equipment.” Medical staff will need to update training to “address effects on personnel, including changes in extreme temperatures, precipitation patterns, and disease vector distribution.” Despite stiff opposition from many Republicans, the Pentagon has released a stream of climate-related warnings, research and adopted new clean energy policies in the past eight years. In 2014 chiefs of staff said it was “overwhelmingly clear” that climate change posed a security risk to the country. Last year the NATO military alliance war-gamed the use of wind and solar energy systems, while the US Navy recently launched a ‘Green Fleet’ partly powered by biofuels. Read More here
8 February 2016, The Conversation, In a heatwave, the leafy suburbs are even more advantaged. Summer brings out the heliophobe in many of us. It’s manageable if you live in a house that stays cool when shut up tight. It helps if you’re physically capable of crossing to the shadier side of a hot street. It’s even better if you can work from home or use public transport stops that enjoy the cover of buildings or trees. We have reason to think a lot about shade these days, especially as the heatwaves roll in. At such times, shade is our friend. On top of the existing urban heat island effect, the incidence of extreme heat events is rising. These events are also lasting longer and getting hotter. Coverage for all is a wonderful ideal, and the federal government has announced plans to set “urban canopy” targets. But, in the meantime, some communities and areas need trees more urgently than others. Shade is not only a matter of public health; it is a social equity issue. In a warming city like Melbourne, some of the most socially vulnerable people are in areas that are most exposed to extreme heat. Our pilot research in Melbourne suggests that integrated social and ecological data sets should be used to develop programs that reduce socioecological vulnerability. Shade can be a life-saver More than twice as many people perished in Melbourne during the 2009 heatwave leading up to Black Saturday than died in the devastating fires on that day. Extreme heat is a slow-motion disaster. The tendency to respond to heat as an emergency rather than planning for an ongoing chronic stress can have deadly consequences, as Annie Bolitho and Fiona Miller argue in a forthcoming paper. Extreme heat events are increasing in duration and intensity, and some parts of cities are more vulnerable than others. AAP/Bureau of MeteorologySocial and geographic isolation, age, disability and existing health conditions all play a role in vulnerability to heat. Vulnerability to urban heat also has a geography: vulnerability is compounded by where people live and whether trees live there with them. Urban authorities are using vegetation to help fight extreme heat in susceptible areas. In large sprawling cities like Melbourne, local councils are working to increase canopy cover in their jurisdictions. Urban forests can mitigate the urban heat island effect and significantly lower surface and ambient air temperatures. Read More here
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