On the launch of the report, Impacts of Sand and Dust Storms on Oceans: A Scientific Environmental Assessment for Policy Makers, author and University of Oxford lecturer, Nick Middleton discusses how the dust cycle affects and interacts with other global-scale biogeochemical cycles.
What exactly are we talking about when we refer to the “dust cycle”?
The dust cycle describes the movement of trillions of tiny particles through the Earth System. Sand and dust is raised by strong winds from areas of bare or sparsely vegetated ground. While some of this material falls back to the surface near the source, the smaller dust particles are carried further in the wind – sometimes thousands of kilometres – before being deposited.
Each year, an estimated two billion tonnes of dust is raised into the atmosphere; and one-quarter of this reaches the oceans.
Is this movement regular and predictable?
These long-distance dust flows are highly seasonal and can vary significantly from year to year. But most dust comes from deserts and semi-deserts, and a particularly dusty area known as the Dust Belt stretches from the Sahara across the Middle East to the deserts of Central and Northeast Asia.
The planet’s largest sources are in the Sahara. Much Saharan dust is transported south-westward by the Harmattan wind that prevails between November and April. This dust has marked effects on the North Atlantic and the Caribbean Sea, but Saharan dust also impacts the Mediterranean Sea and the Red Sea.
What role do sand and dust storms play in a healthy ecosystem?
Desert dust particles consist of minerals, nutrients, and organic and inorganic matter. Dust plays a role in a range of Earth’s physical, chemical and bio-geological processes, and interacts with the cycles of energy, nitrogen, carbon, and water. All are necessary for Earth system functions.
How do they affect ocean ecosystems?
Dust carries nutrients such as phosphorus, and trace metals—including iron, manganese, titanium, aluminium—to oceanic ecosystems, elements that are essential for all life forms. In this way, desert dust is a principal driver of oceanic primary productivity, which forms the base of the marine food web.
Marine primary production also fuels the global carbon cycle via the exchange of CO2 between ocean and atmosphere, so desert dust has impacts on our climate system. Dust also provides some of the building blocks for coral reefs: dust particles are incorporated into coral skeletons as they grow.
Desert dust also provides the primary external source of iron to offshore waters, but controls on iron aerosol solubility are poorly understood. Iron is required for phytoplankton growth, but the iron must be in a form that can be used by living organisms, which is dependent partly on its solubility. What are some of the negative effects of sand and dust storms?
The fertilizing effect of desert dust is thought to have an impact on algal blooms, some of which can be harmful, and may contribute to Sargassum seaweed mats. Unusually large blooms of floating Sargassum seaweed have been noted since 2011 in parts of the Caribbean Sea and along the Atlantic coastlines of West Africa and Brazil. These drifting seaweed mats provide important habitat for many species in the open ocean, but close to shore, they can disrupt shipping, fishing and tourism.
Potential links have also been identified between microorganisms, trace metals and organic contaminants carried in desert dust and some of the complex changes on coral reefs observed in numerous parts of the world. Disease has undoubtedly been an important factor in recent coral reef declines worldwide and several of the diseases that affect corals are associated with microorganisms carried in desert dust.
A wide variety of microorganisms—including fungi, bacteria and viruses—has been found in desert dust. Most of these pathogens come from dryland soils and are highly resistant to desiccation, temperature extremes, conditions of high salinity and exposure to ultraviolet radiation. They are therefore typically able to survive in the atmosphere for many days.
Do sand and dust storms play a role in transporting diseases like COVID-19?
We still have numerous basic questions to answer regarding these desert-derived bioaerosols. It is thought that many of the microorganisms transported in desert dust are capable of causing disease outbreaks in a wide range of organisms, both terrestrial and marine, but we have little data on specific microbes found in dust storms known to cause disease in people and animals.
How does this report contribute to existing knowledge about sand and dust storms?
While our understanding of the dust cycle has improved greatly in recent decades, large uncertainties and knowledge gaps remain. Nonetheless, this knowledge has significant implications for a number of Sustainable Development Goals – particularly Goal 14 on Life Below Water and Goal 15 on Life on Land.
Marking the start of the United Nations Decade of Ocean Science for Sustainable Development (2021–2030), this report explores the impacts of sand and dust storms on oceans—their ecosystem functions, goods and services—which are potentially numerous and wide-ranging. Sand and dust storms thus warrant continued careful monitoring and research.
How UNEP is helping education systems go green
The world is facing a three-pronged environmental crisis of climate change, nature and biodiversity loss, and pollution and waste. To turn around the planet’s fortunes, the participation of young people will be key, says Sam Barratt, Head of the United Nations Environment Programme (UNEP) Youth, Education and Advocacy Unit.
Ahead of the International Day of Education on 24 January, we spoke to Barratt about the role of young people in reviving the natural world and what UNEP is doing to enlist their support.
Lots of different players are involved in youth education. What is UNEP’s mandate?
Sam Barratt (SB): The UN Educational, Scientific and Cultural Organization (UNESCO) is the lead on education in the UN system. But here at UNEP, we work closely with them, focusing on non-formal education and higher education. This mandate allows us to work with major global partners and networks that can reach millions to bring environmental issues into the curriculum of schools, on to university campuses, into massive games, such as Subway Surfers, or even into Scout and Girl Guide badge curricula. It’s a huge opportunity to shift norms and reach billions of youth, both inside and outside the classroom.
Collaborating with universities to promote sustainable development seems to be a key aspect of UNEP’s education work. Is that right?
SB: Yes, it’s huge as universities produce the leaders of tomorrow. Our approach is to see how universities can be Petri dishes to shift the habits of students. In September 2020, UNEP launched The Little Book of Green Nudges in 136 campuses around the world. It’s a quick guide composed of 40 nudges to spark sustainable behaviour among students and staff.
In 2021 we launched UNEP’s Sustainable University Framework, which seeks to define what it means to be a sustainable university and lays out a pathway to becoming one, and the Global Guidance for Education on Green Jobs. These initiatives are designed to give the higher education community, employers and youth organizations the tools to prepare students to participate in a green transition.
And in October 2021, UNEP worked with Times Higher Education to organize the inaugural Climate Impact Forum at which Times Higher Education launched its new data-led report, The Race to Net Zero. It presented how well higher education institutions across the globe are performing when it comes to reducing their own greenhouse gas emissions and transitioning to net zero. So far 1,086 universities from 68 countries, representing over 10 million students, made commitments to reach net-zero emissions by 2050.
What are you doing to support developing countries?
SB: There are already lots of networks in Europe and North America, but we want to focus on emerging economies. Given this, we’ve launched the Africa Green University and Youth Education Network hosted by the Hassan II International Centre for Environmental Training in Morocco. The network is growing and now includes 22 universities from eight African countries. With the support of the TERI School of Advanced Studies, we talked to stakeholders who agreed that there is a need to establish an India Green University Network. The plan is for this network to be built up and officially launched in 2022.
Any initiatives specifically on the climate front?
SB: Yes. We’ve provided early support for initiatives such as Count Us In, a campaign that aims to inspire 1 billion people to take simple, impactful actions which will directly reduce carbon dioxideemissions, accelerate the uptake of climate solutions and challenge leaders to act boldly to deliver global systems change.
Hundreds of millions of young people play video games. How is UNEP working with the video gaming industry to promote environmental awareness?
SB: UNEP facilitates the Playing for the Planet Alliance, which is an initiative in support of the video gaming industry to use their influence, reach, and creativity to address some of the world’s biggest environmental challenges. Gaming companies in the alliance have made commitments ranging from integrating green activations in games to reducing their emissions. Since the Playing for the Planet Alliance was launched in 2019, 60 per cent of its members have made a commitment to become net zero or carbon negative by 2030. On top of that, the second annual Green Game Jam welcomed 30 (game) studios with a combined reach of 1 billion players.
UNEP’s GEO-6 for Youth report shows how youth have the power to bring about transformative change for the environment. How is UNEP getting youth to help tackle the scourge of single-use plastics?
SB: The Tide Turners Plastic Challenge Badge seeks to support the World Organization of the Scout Movement, the World Associations of Girl Guides and Scouts, Junior Achievement and university students to take action to reduce single-use plastic in their lives. Since February 2019, more than 470,000 young people have started the badge in over 32 countries in Africa, Asia and the Caribbean. Thanks to financial support from the United Kingdom government this work will continue in 2022.
UNEP and partners launched “Earth School” in April 2020 in response to school closures in the wake of the pandemic. In just three weeks, it reached nearly 1 million students. How did you come up with such an idea?
SB: We saw that many pupils, parents and teachers were struggling with COVID-19 so we wanted to try and do something different. Earth School was built with educators and over 40 partners and shows what can happen when a big idea is run by many. It’s the biggest online learning initiative in UNEP’s history and is available for free on TED-Ed’s website.
2021 joins top 7 warmest years on record
Last year joined the list of the seven warmest years on record, the UN weather agency said on Wednesday, and was also the seventh consecutive year when the global temperature has been more than 1°C above pre-industrial levels; edging closer to the limit laid out under the 2015 Paris Agreement on Climate Change.
Although average global temperatures were temporarily cooled by the 2020-2022 La Niña events, 2021 was still one of the seven warmest years on record, according to six leading international datasets consolidated by the World Meteorological Organization (WMO).
Global warming and other long-term climate change trends are expected to continue as a result of record levels of heat-trapping greenhouse gases in the atmosphere, the agency said.
The average global temperature in 2021 was about 1.11 (± 0.13) °C above the pre-industrial era levels. The Paris Agreement calls for all countries to strive towards a limit of 1.5°C of global warming through concerted climate action and realistic Nationally Determined Contributions – the individual country plans that need to become a reality to slow down the rate of heating.
WMO said that it uses six international datasets “to ensure the most comprehensive, authoritative temperature assessment”, and the same data are used in its authoritative annual State of the Climate reports.
Since the 1980s, each decade has been warmer than the previous one, said WMO and “this is expected to continue.”
The warmest seven years have all been since 2015; the top three being 2016, 2019 and 2020. An exceptionally strong El Niño event occurred in 2016, which contributed to record global average warming.
“Back-to-back La Niña events mean that 2021 warming was relatively less pronounced compared to recent years. Even so, 2021 was still warmer than previous years influenced by La Niña”, said WMO Secretary-General, Prof. Petteri Taalas.
“The overall long-term warming as a result of greenhouse gas increases, is now far larger than the year-to-year variability in global average temperatures caused by naturally occurring climate drivers”.
“The year 2021 will be remembered for a record-shattering temperature of nearly 50°C in Canada, comparable to the values reported in the hot Saharan Desert of Algeria, exceptional rainfall, and deadly flooding in Asia and Europe as well as drought in parts of Africa and South America”, the WMO chief added.
“Climate change impacts and weather-related hazards had life-changing and devastating impacts on communities on every single continent”, Mr. Taalas underscored.
Others key indicators of global heating include greenhouse gas concentrations, ocean heat content, ocean pH levels (levels of acidity), global mean sea level, glacial mass and the extent of sea ice.
WMO uses datasets – which are based on monthly climatological data from observing sites and ships and buoys in global marine networks – developed and maintained by the US National Oceanic and Atmospheric Administration (NOAA), NASA’s Goddard Institute for Space Studies (NASA GISS), the United Kingdom’s Met Office Hadley Centre, and the University of East Anglia’s Climatic Research Unit (HadCRUT); and the Berkeley Earth group.
WMO also uses reanalysis datasets from the European Centre for Medium Range Weather Forecasts and its Copernicus Climate Change Service, and the Japan Meteorological Agency (JMA).
WMO said that the temperature figures will be incorporated into its final report on the State of the Climate in 2021, which will be issued in April this year.
In Jamaica, farmers struggle to contend with a changing climate
It’s 9 am and the rural district of Mount Airy in central Jamaica is already sweltering. As cars trundle along the region’s unpaved roads, chocolate-brown dust clouds burst from behind their back wheels.
It is here, 50km west of Kingston and 500 meters above sea level, that the Mount Airy Farmers group are having a morning meeting. There are around two dozen people and they all say the same thing; they’re struggling to keep their plots productive amid dwindling rainfall, a byproduct of climate change.
“The weather here’s a lot drier for longer these days,” says Althea Spencer, the treasurer of the Mount Airy Farmers group, which is based in Northern Clarendon. “If you don’t have water, it makes no sense to plant seeds because they will just die.”
The farmers though, have recently gotten some help in their search for water.
Just meters from where they are gathered stands a two-storey shed with a drainpipe on the roof that funnels rainwater into a tall, black tank. It’s one of more than two dozen reservoirs dotted across these mountains. They are part of a project backed by six United Nations (UN) bodies to help Mount Airy’s farmers adapt to climate change.
“This partnership among the UN and with communities is exactly the type of activity needed to address the day-to-day and practical impacts of climate change,” says Vincent Sweeney, Head of the Caribbean Sub-Regional Office at the United Nations Environment Programme (UNEP). “As we look beyond the Glasgow Climate Change Conference, it is vital that we… adapt to the new realities of a warmer planet in order to protect lives and livelihoods in Jamaica and the Caribbean.”
The challenge is not unique to the region. Droughts, floods, and the spread of pests, the byproducts of climate change, are threatening agricultural production around the globe, says the Food and Agriculture Organization. That is potentially disastrous in a world where almost 700 million people go hungry each year.
Small-hold farmers, who work more than 80 per cent of the world‘s farms, in particular, will need support to remain resilient in the face of climate change, say experts.
A country at risk
Farmers in Jamaica, an island nation of 3 million, are especially vulnerable. In 2020, Jamaica became the first Caribbean country to submit a tougher climate action plan to the UN because the country was at risk from rising sea levels, drought and more intense hurricanes, its government said.
In 2018, the Mount Airy farmers enrolled in the United Nations-backed programme that helps build the resilience of communities to threats such as climate change, poverty and water insecurity. It is regarded as the first joint programme of the United Nations in Jamaica, combining the resources of six agencies, including UNEP.
In Mount Airy, the UN programme has invested in 30 new water harvesting systems. The large, black tanks, which appear across the hilltops like turrets, catch and store rainfall, allowing the farmers to use it evenly via a drip irrigation system. This reduces the emerging threat of longer and more intense dry spells.
The new irrigation system also frees farmers from watering their crops by hand. “Before we got the new system, you had to predict rainfall to put seedlings in,” says Spencer, a rollerball pen tucked neatly into her hair and her feet shifting on the sunbaked earth. “It feels pretty good. It allows me more time to do housework, keep up with my farm records, and I have time to go down to the market.”
Alongside the tanks sit drums which mix fertilizer with water and spread it evenly among the crops, saving the farmers valuable time. The dissolvable fertilizer is also cheaper than standard fertilizers.
On top of that, the irrigation system improves yields. Spencer now grows and sells more sweet potatoes, peppers and tomatoes than ever before.
Coupled with the water tanks, the programme has also prioritized education. Seminars are run by the Rural Agricultural Development Authority, a government agency, which aims to broaden the farmer’s knowledge and skills.
Although it is not unusual for women to farm these lands, Spencer speaks about how the trainings have helped to empower the female members of the group by coming together. “To me, the learnings and the trainings bond us ladies together,” she says.
A life in the mountains
Back at the gathering of the Mount Airy farmers, the assembled say some prayers and repeat their mantra aloud two times: “We are the Mount Airy Farmers Group our motto is: All grow in fear and failure bearing fruits of confidence and success.”
Spencer, who is in her 40s, is a vocal participant at the meeting and obviously well-liked. She was born in Mount Airy and has been farming these fields most of her life. She has vivid memories of working on her father’s farm as a child. Unable to afford to pay anyone else, he often pulled her out of school to sow and reap the fields.
That’s a common refrain among many who grew up in Mount Airy – and one the new UN programme is aiming to change.
“If my father had this harvesting system, would I have gone to school more?” Spencer asks herself. “Yes, probably. But even then, he was always working us. So I’m sure he’d find something for us to do,” she says laughing.
Spencer welcomes the introduction of the water tanks. However, she says current rainfall patterns mean water sometimes still runs out. “If you don’t manage your water properly, one will run out before you get anywhere,” she says ominously.
Her story may be one of success today, but it shows that living with climate change will require adaptation and continued investment for years to come. UNEP’s 2021 Adaptation Gap Report called for an urgent increase in financing for climate adaptation. It found that adaptation costs in developing countries are five to ten times greater than current public adaptation finance flows, and the adaptation finance gap is widening.
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