If emissions continue unchecked, summers in the Northern Hemisphere could last nearly six months by 2100, according to a new study published in the journal Geophysical Research Letters. Scientists say the shift in seasons will likely have significant impacts on agriculture, the environment, human health, and the timing of species’ activities such as breeding, feeding, and migration.
The research, led by scientists at the State Key Laboratory of Tropical Oceanography in China, analyzed six decades of historical daily climate records, and used climate models to project future trends. It defined summer as the “onset of temperatures in the hottest 25 percent during that time period, while winter began with temperatures in the coldest 25 percent.”
On average, the study found, the number of summer days in the Northern Hemisphere jumped from 78 to 95 between 1952 and 2011. Winter, meanwhile, shrank from 76 to 73 days over the same period. Spring contracted from 124 to 115 days, and autumn from 87 to 82 days.
The scientists projected that if these trends continue, summer will last almost six months out of the year, winter will shrink by two months, and spring and autumn will shrink as well. With the extension of summer comes more intense heat waves and extreme weather events like droughts and wildfires.
“Summers are getting longer and hotter while winters shorter and warmer due to global warming,” Yuping Guan, a physical oceanographer at the State Key Laboratory of Tropical Oceanography and lead author of the new study, said in a statement. “Numerous studies have already shown that the changing seasons cause significant environmental and health risks.”
As the world struggles with COVID-19, the challenges of climate change and wider environmental problems loom large. It is clear that the economic response to the impact of COVID-19 must benefit the environment while plans to address climate change and environmental issues must benefit the economy and society. The only way these twin imperatives can be met is through a green revolution that transcends our economy and society.
This was our task when we both chaired the first Intelligent Planning Consultative Forum that was established by Environment Minister Aaron Farrugia. The aim of the forum was to bring together all stakeholders involved in the planning and construction sectors to start coming up with ways in which we can transform and transition planning and construction which is smart, green and sustainable.
The result of this forum and the discussions we led is the green policy document on green walls and roofs together with the recently-launched scheme by the government to incentivise such improvements.
This incentive scheme should be seen as the first step towards having greener and more sustainable buildings. The benefits of such interventions are major given that they result in low energy consumption and decreased carbon emissions while mitigating the effects of roof flooding. This happens as the green infrastructure, walls or roofs, acts as a protective layer for buildings, absorbing heat and excess water.
Additionally, the utilisation of local fauna in such projects would create various pollination havens across the island, helping to restore natural biodiversity – a key aim of the EU’s 2030 biodiversity strategy. The utilisation of Maltese fauna could have the additional benefit of requiring minimal maintenance and reduce the consumption of water.
Such initiatives also have macro effects including the creation of additional value-adding activities and green jobs. Together with other initiatives and incentives, the demand for such products could even help kickstart a whole new industry focused on green construction.One of Malta’s biggest opportunities in the Green Deal is greening the construction sector
In fact, one of Malta’s biggest opportunities in the Green Deal is greening the construction sector which remains a significant contributor to economic growth. The EU recently launched the New European Bauhaus and, in a statement, European Commission president Ursula von der Leyen said that “the New European Bauhaus is about how we live better together after the pandemic while respecting the planet and protecting our environment. It is about empowering those who have the solutions to the climate crisis, matching sustainability with style”.
This is something we believe can truly support the country in its next phase of design, planning and construction. Malta and Europe have a number of common challenges. Whereas the original Bauhaus was focused on new designs, the biggest challenge we face is of renovation, regeneration and retrofitting.
We are surrounded by buildings and infrastructures, home to both embodied carbon and embedded histories. A design and architecture for this problem requires a quite different sensibility. It implies a refining in place, understanding repair and retrofit cultures and developing new logics predicated on care and maintenance.
These approaches, in line with the EU Recovery Strategy, necessitate new ways of unleashing the societal value latent in people and place. Producing anew in this way is far more challenging than simply making new things –although new things will emerge.
Malta has a unique potential in this and, if leveraged properly, we can truly kick-start a green revolution in our planning and building industries. We are confident that the new phase of the Intelligent Planning Consultative Forum will look into this and, together with the environment minister, a new era of Malta’s planning and construction industry can commence, one that is smart, green and sustainable.
The green wall and roof initiative and support scheme is a step in the right direction.
Cyrus Engerer is a Labour MEP and Stephanie Fabri is an economist and a lecturer at the University of Malta.
The Massachusetts Institute of Technology asking Why the Mediterranean is a climate change hotspot came up with A new analysis uncovers the basis of the severe rainfall declines predicted by many models.
17 June 2020
Although global climate models vary in many ways, they agree on this: The Mediterranean region will be significantly drier in coming decades, potentially seeing 40 percent less precipitation during the winter rainy season.
An analysis by researchers at MIT has now found the underlying mechanisms that explain the anomalous effects in this region, especially in the Middle East and in northwest Africa. The analysis could help refine the models and add certainty to their projections, which have significant implications for the management of water resources and agriculture in the region.
The study, published last week in the Journal of Climate, was carried out by MIT graduate student Alexandre Tuel and professor of civil and environmental engineering Elfatih Eltahir.
The different global circulation models of the Earth’s changing climate agree that temperatures virtually everywhere will increase, and in most places so will rainfall, in part because warmer air can carry more water vapor. However, “There is one major exception, and that is the Mediterranean area,” Eltahir says, which shows the greatest decline of projected rainfall of any landmass on Earth.
“With all their differences, the models all seem to agree that this is going to happen,” he says, although they differ on the amount of the decline, ranging from 10 percent to 60 percent. But nobody had previously been able to explain why.
Tuel and Eltahir found that this projected drying of the Mediterranean region is a result of the confluence of two different effects of a warming climate: a change in the dynamics of upper atmosphere circulation and a reduction in the temperature difference between land and sea. Neither factor by itself would be sufficient to account for the anomalous reduction in rainfall, but in combination the two phenomena can fully account for the unique drying trend seen in the models.
The first effect is a large-scale phenomenon, related to powerful high-altitude winds called the midlatitude jet stream, which drive a strong, steady west-to-east weather pattern across Europe, Asia, and North America. Tuel says the models show that “one of the robust things that happens with climate change is that as you increase the global temperature, you’re going to increase the strength of these midlatitude jets.”
But in the Northern Hemisphere, those winds run into obstacles, with mountain ranges including the Rockies, Alps, and Himalayas, and these collectively impart a kind of wave pattern onto this steady circulation, resulting in alternating zones of higher and lower air pressure. High pressure is associated with clear, dry air, and low pressure with wetter air and storm systems. But as the air gets warmer, this wave pattern gets altered.
“It just happened that the geography of where the Mediterranean is, and where the mountains are, impacts the pattern of air flow high in the atmosphere in a way that creates a high pressure area over the Mediterranean,” Tuel explains. That high-pressure area creates a dry zone with little precipitation.
However, that effect alone can’t account for the projected Mediterranean drying. That requires the addition of a second mechanism, the reduction of the temperature difference between land and sea. That difference, which helps to drive winds, will also be greatly reduced by climate change, because the land is warming up much faster than the seas.
“What’s really different about the Mediterranean compared to other regions is the geography,” Tuel says. “Basically, you have a big sea enclosed by continents, which doesn’t really occur anywhere else in the world.” While models show the surrounding landmasses warming by 3 to 4 degrees Celsius over the coming century, the sea itself will only warm by about 2 degrees or so. “Basically, the difference between the water and the land becomes a smaller with time,” he says.
That, in turn, amplifies the pressure differential, adding to the high-pressure area that drives a clockwise circulation pattern of winds surrounding the Mediterranean basin. And because of the specifics of local topography, projections show the two areas hardest hit by the drying trend will be the northwest Africa, including Morocco, and the eastern Mediterranean region, including Turkey and the Levant.
That trend is not just a projection, but has already become apparent in recent climate trends across the Middle East and western North Africa, the researchers say. “These are areas where we already detect declines in precipitation,” Eltahir says. It’s possible that these rainfall declines in an already parched region may even have contributed to the political unrest in the region, he says.
“We document from the observed record of precipitation that this eastern part has already experienced a significant decline of precipitation,” Eltahir says. The fact that the underlying physical processes are now understood will help to ensure that these projections should be taken seriously by planners in the region, he says. It will provide much greater confidence, he says, by enabling them “to understand the exact mechanisms by which that change is going to happen.”
Eltahir has been working with government agencies in Morocco to help them translate this information into concrete planning. “We are trying to take these projections and see what would be the impacts on availability of water,” he says. “That potentially will have a lot of impact on how Morocco plans its water resources, and also how they could develop technologies that could help them alleviate those impacts through better management of water at the field scale, or maybe through precision agriculture using higher technology.”
The work was supported by the collaborative research program between Université Mohamed VI Polytechnique in Morocco and MIT.
In AFRICATECH of August 22, 2019; More deals, less conflict? Wondered Laurie Goering, Thomson Reuters Foundation whilst Cross-border water planning key, report warns.
LONDON, Aug 22 (Thomson Reuters Foundation) – Efforts to share rivers, lakes, and aquifers that cross national boundaries are falling short, raising a growing risk of conflict as global water supplies run low, researchers warned on Thursday.
Fewer than one in three of the world’s transboundary rivers and lake basins and just nine of the 350 aquifers that straddle more than one country have cross-border management systems in place, according to a new index by the Economist Intelligence Unit.
With more than half the world’s population likely to live in water-scarce areas by 2050 and 40 percent dependent on transboundary water, that is a growing threat, said Matus Samel, a public policy consultant with the Economist Intelligence Unit.
“Most transboundary basins are peaceful, but the trend is that we are seeing more and more tensions and conflict arising,” he told the Thomson Reuters Foundation.
When work began on the index, which looks at five key river basins around the world from the Mekong to the Amazon, researchers thought they would see hints of future problems rather than current ones, Samel said.
Instead, they found water scarcity was becoming a “very urgent” issue, he said. “It surprised me personally the urgency of some of the situation some of these basins are facing.”
Population growth, climate change, economic and agricultural expansion and deforestation are all placing greater pressures on the world’s limited supplies of water, scientists say.
As competition grows, some regions have put in place relatively effective bodies to try to share water fairly, the Economist Intelligence Unit report said.
Despite worsening drought, the Senegal River basin, shared by West African nations including Senegal, Mali, and Mauritania, has held together a regional water-governance body that has attracted investment and support, Samel said.
Efforts to jointly govern the Sava River basin, which crosses many of the once warring nations of the former Yugoslavia in southeast Europe, have also been largely successful, he said.
But replicating that is likely to be “a huge challenge” in conflict-hit basins, such as along the Tigris and Euphrates rivers in Iraq and Syria, Samel said.
Still, even in tough political situations, “there are ways … countries and local governments and others can work together to make sure conflicts do not emerge and do not escalate,” he said.
“The benefits of cooperation go way beyond direct access to drinking water,” he said. “It’s about creating trust and channels for communication that might not otherwise exist.”
‘NO EASY SOLUTIONS’
The report suggests national leaders make water security a priority now, link water policy to other national policies, from agriculture to trade, and put in place water-sharing institutions early.
“There are no easy solutions or universal solutions,” Samel warned. “But there are lessons regions and basins can learn and share.”
The index has yet to examine many hotspots, from the Nile River and Lake Chad in Africa to the Indus river system in India and Pakistan, but Samel said it would be expanded in coming years.
Working toward better shared water management is particularly crucial as climate change brings more drought, floods, and other water extremes, said Alan Nicol, who is based in Ethiopia for the International Water Management Institute.
“Knowing how a system works effectively helps you know what to do in the face of a massive drought or flood event – and we should expect more extreme weather,” he said.
While efforts to coordinate water policy with other national and regional policies and priorities are crucial, the key missing element in shoring up water security is political will, he said.
“We’ve been talking about this kind of integrated water management for 30 years,” he said. “The problem is practicing it. And that’s essentially a political problem.”
Reporting by Laurie Goering @lauriegoering; Editing by Claire Cozens. Please credit the Thomson Reuters Foundation, the charitable arm of Thomson Reuters, that covers humanitarian news, climate change, resilience, women’s rights, trafficking, and property rights. Visit news.trust.org/climate
The word “climate” makes most of us look up to the sky – however, the IPCC’s new special report on climate change and land should make us all look under our feet. This is how Anna Krzywoszynska, Research Fellow and Associate Director of the Institute for Sustainable Food, University of Sheffield introduced her article published on The Conversation of last week before adding that ‘Land, the report shows, is intimately linked to the climate. Changes in land use result in changes to the climate and vice versa. In other words, what we do to our soils, we do to our climate – and ourselves.’ So, keeping Global Warming to well below 2°C is the hurdle that all humans need to get over in order to achieve the Paris Agreement requirements.
Land is already under growing human pressure and climate change is adding to these pressures. At the same time, keeping global warming to well below 2C can be achieved only by reducing greenhouse gas emissions from all sectors including land and food, the Intergovernmental Panel on Climate Change (IPCC) said in its latest report.
“Governments challenged the IPCC to take the first ever comprehensive look at the whole land-climate system. We did this through many contributions from experts and governments worldwide. This is the first time in IPCC report history that a majority of authors – 53 per cent – are from developing countries,” said Hoesung Lee, chair of the IPCC.
This report shows that better land management can contribute to tackling climate change, but is not the only solution. Reducing greenhouse gas emissions from all sectors is essential if global warming is to be kept to well below 2C, if not 1.5C.
In 2015, governments backed the Paris Agreement goal of strengthening the global response to climate change by holding the increase in the global average temperature to well below 2C above pre-industrial levels and to pursue efforts to limit the increase to 1.5C.
Land must remain productive to maintain food security as the population increases and the negative impacts of climate change on vegetation increase. This means there are limits to the contribution of land to addressing climate change, for instance through the cultivation of energy crops and afforestation. It also takes time for trees and soils to store carbon effectively.
Bioenergy needs to be carefully managed to avoid risks to food security, biodiversity and land degradation. Desirable outcomes will depend on locally appropriate policies and governance systems.
Climate Change and Land finds that the world is best placed to tackle climate change when there is an overall focus on sustainability. “Land plays an important role in the climate system,” said Jim Skea, Co-Chair of IPCC Working Group III.
“Agriculture, forestry and other types of land use account for 23 per cent of human greenhouse gas emissions. At the same time natural land processes absorb carbon dioxide equivalent to almost a third of carbon dioxide emissions from fossil fuels and industry,” he said.
The report shows how managing land resources sustainably can help address climate change, said Hans-Otto Pörtner, co-chair of IPCC Working Group II.
“Land already in use could feed the world in a changing climate and provide biomass for renewable energy, but early, far-reaching action across several areas is required. Also for the conservation and restoration of ecosystems and biodiversity,” he added.
Desertification and land degradation
When land is degraded, it becomes less productive, restricting what can be grown and reducing the soil’s ability to absorb carbon. This exacerbates climate change, while climate change, in turn, exacerbates land degradation in many different ways.
“The choices we make about sustainable land management can help reduce and in some cases reverse these adverse impacts,” said Kiyoto Tanabe, co-chair of the Task Force on National Greenhouse Gas Inventories.
“In a future with more intensive rainfall the risk of soil erosion on croplands increases, and sustainable land management is a way to protect communities from the detrimental impacts of this soil erosion and landslides. However there are limits to what can be done, so in other cases degradation might be irreversible,” he said.
Roughly 500 million people live in areas that experience desertification. Drylands and areas that experience desertification are also more vulnerable to climate change and extreme events including drought, heatwaves, and dust storms, with an increasing global population providing further pressure.
The report sets out options to tackle land degradation and prevent or adapt to further climate change. It also examines potential impacts from different levels of global warming. “New knowledge shows an increase in risks from dryland water scarcity, fire damage, permafrost degradation and food system instability, even for global warming of around 1.5C,” said Valérie Masson-Delmotte, co-chair of IPCC Working Group I.
“Very high risks related to permafrost degradation and food system instability are identified at 2°C of global warming,” she said.
Originally posted on RobinAndrew: An initially-slight tale, which grows and grows right up to its end, as slight lives desperately try to grow themselves into something important without completely relinquishing the comforts to which they have accustomed themselves. Emerson writes with an almost nineteenth-century reserve which aptly suits her characters and relates as well to…
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