26/08/2021

(AU ABC) Study Finds Green Roofs Make Solar Panels More Efficient

ABC News - Ursula Malone

Researchers compared the energy output on two neighbouring roofs. (ABC News: Ursula Malone)

Key Points
  • Study finds solar panels work better when they're not too hot
  • Over eight months, the roof with greenery generated an additional $2,595 worth of renewable energy
  • Sustainability expert says green roofs can help in the fight against climate change
Two identical office buildings side by side in Sydney's Barangaroo provided a perfect opportunity for solar energy researchers to test a long-held hunch. Would surrounding rooftop solar panels with green plants make them more efficient?

The answer, as it turned out, was yes.

The study was led by Peter Irga from the University of Technology Sydney and funded by the City of Sydney Council.

"For the first time we had the opportunity to compare these two buildings against each other," Dr Irga said.

Solar panels on the green roof at Daramu House produced 3.6 per cent more electricity than those on a neighbouring rooftop. (ABC NEWS: Ursula Malone)

On hot days, surface temperatures were up to 20 degrees lower on the green roof compared with the standard solar roof. (Supplied: University of Technology, Sydney.)

On top of one of the buildings was a conventional photovoltaic solar system. On the other, researchers surrounded the solar panels with plants and foliage. They then compared how much energy the two solar systems produced over an eight-month period.

What they found was that the "green roof" improved performance by as much as 20 per cent at peak times and by 3.6 per cent over the length of the experiment.

Dr Irga said that solar panels actually worked better when they were not too hot.

On the green roof plants helped keep the solar panels at optimum temperatures. (ABC NEWS: Ursula Malone)

"We are blessed in Australia to have so much sunlight but temperatures above 25 degrees make photovoltaic panels less efficient," he said.
Jock Gammon is the co-founder of Junglefy, the company that installed the green roof.

"We had heard of anecdotal evidence there was improved performance but we have seen up to 3.6 per cent increase in solar panel output," he said.

"Now that doesn't sound like a lot but with solar panels at the moment to even get a one or two per cent increase is a big deal."

Jock Gammon, co-founder of Junglefy, said green roofs can help future-proof cities. (ABC News: Ursula Malone)

Over eight months the green roof generated an additional 9.5 MWh or $2,595 worth of renewable energy.

The extra energy could be sold back to the grid resulting in a cost saving for the building.

Lucy Sharman, sustainability manager for Lendlease, which owns the building said the study proved "something that's been a bit of theory for a while".

"As the results started to come through about how much more efficient the solar panels were, how much cooler this roof was that was really exciting."

On hot days, the surface temperature on the green roof was up to 20C lower compared with the roof with no plants.

Mr Gammon said green roofs had a role to play in future-proofing cities against the damaging effects of climate change.

Lucy Sharman, Sustainability manager at Lendlease, on the green roof at Barangaroo. (ABC NEWS: Ursula Malone)

"If we're able to keep our hard surfaces non-absorbent, they're not releasing that heat back into the air at night and we're not then having to use a lot more electricity to reduce those temperatures."

As well as cooling the building, the green roof absorbed almost nine tonnes of greenhouse gases.

During storms, the plants soaked up heavy rain, reducing the amount of storm water run-off and decreasing the risk of flash flooding.

"We're looking at 600 litres per second sequestered into the green roof as opposed to going into the system," Dr Irga said.

For those involved in the study, one of the most exciting outcomes was the increase in biodiversity in the heart of the city.

In just a few months, the rooftop has attracted a wide range of insects, birds and native bees.

"Very quickly the wildlife up here was amazing," Ms Sharman said.

Motion sensor cameras captured images of birds visiting the rooftop. (Supplied: University of Technology Sydney.)

Researchers captured images of birds on the green roof. (Supplied: University of Technology Sydney)

"That's the thing that's been most positive. Even a small amount of green space can make actually quite a significant difference." Researchers said they even found evidence that predatory birds were using the rooftop.

"To attract any animals that high up in the middle of the CBD is quite astounding," Dr Irga said.

In the cities of the future, green roofs could also provide valuable outdoor space for humans.

"Particularly in the middle of lockdown, we are really craving green and open spaces and there are lots of little nooks and crannies in cities that are not being used," Ms Sharman said.

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(AU The Conversation) Ordinary People, Extraordinary Change: Addressing The Climate Emergency Through ‘Quiet Activism’

The Conversation |  |  |  | 

Shutterstock

Authors
  •  is Associate Professor, Centre for Urban Research, RMIT University
  •  is Adjunct research academic, Curtin University
  •  is Associate Professor, School of Social Sciences, Macquarie University
  •  is Professor of Human Geography and Planning, University of Tasmania
  •  is Professor Emerita, RMIT University     
Across the world, people worried about the impacts of climate change are seeking creative and meaningful ways to transform their urban environments.

One such approach is known as “quiet activism”.

“Quiet activism” refers to the extraordinary measures taken by ordinary people as part of their everyday lives, to address the climate emergency at the local level.

In the absence of national leadership, local communities are forging new responses to the climate crisis in places where they live, work and play.

As we outline in a book released this month, these responses work best when they are collaborative, ongoing and tailored to local circumstances.

Here are three examples that show how it can be done.

Climate for Change: a Tupperware party but make it climate

Climate for Change is a democratic project in citizen-led climate education and participation.

This group has engaged thousands of Australians about the need for climate action — not through public lectures or rallies, but via kitchen table-style local gatherings with family and friends.

As they put it:
We’ve taken the party-plan model made famous by Tupperware and adapted it to allow meaningful discussions about climate change to happen at scale.
Their website quotes “Jarrod”, who hosted one such party, saying:
I’ve been truly surprised by the lasting impact of my conversation amongst friends who were previously silent on the issue – we are still talking about it nine months on.
Climate for Change has published a “climate conversation guide” to help people tackle tricky talks with friends and family about climate change.

It has also produced a resource on how to engage your local MP on climate change. EnviroHouse: hands-on community education

EnviroHouse
is a not-for-profit organisation based in Western Australia committed to local-scale climate action through hands-on community education and engagement projects, such as:
  • facilitating workshops on energy efficiency
  • visiting schools on request to provide sustainability services
  • collecting seeds to grow thousands of she-oaks, paperbarks and rushes along the eroded Maylands foreshore in Perth
  • teaching workshops on composting, worm farming and bokashi techniques to community members
  • giving talks on sustainable living
  • running a home and workplace energy and water auditing program
Climarte: arts for a safe climate Climarte is a group that
collaborates with a wide range of artists, art professionals, and scientists to produce compelling programs for change. Through festivals, events and interventions, we invite those who live, work and play in the arts to join us.
This group aims to create a space which brings together artists and the public to work, think and talk through the implications of climate change.

Why quiet?

Quiet activism raises questions around what it means to be an activist, or to “do activism”.

While loud, attention-grabbing and disruptive protests are important, local-scale activities are also challenging the “business as usual” model. These quiet approaches highlight how ordinary citizens can take action every day to generate transformative change.

There is a tendency within climate activism to dismiss “quiet” activities as merely a precursor to bigger, more effective (that is, “louder”) political action.

Everyday local-scale activities are sometimes seen as disempowering or conservative; they’re sometimes cast as privileging individual roles and responsibility over collective action.

However, a growing range of voices draws attention to the transformative potential of small, purposeful everyday action.

UK-based researcher Laura Pottinger emphasises that these everyday practices are acts of care and kindness to community — both human and non-human.

Her interest is a “dirt under the fingernails” kind of activism, which gains strength from a quiet commitment to practical action.

Researcher Laura Pottinger argues that a kind of ‘dirt under the fingernails’ activism gains strength from a quiet commitment to practical action. Shutterstock

Climate action, here and how

The climate crisis has arrived and urgent action is required.

By creatively participating in local climate action, we can collectively reimagine our experience of, and responses to, the climate emergency.

In doing so, we lay the foundation for new possibilities.

Quiet activism is not a panacea. Like any other form of activism, it can be ineffective or, worse, damaging. Without an ethical framework, it risks enabling only short-lived action, or leading to only small pockets of localised activity.

But when done ethically and sustainably — with long-term impact in mind — quiet activism can make a profound difference to lives and communities.

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(Foreign Policy) The Middle East Is Becoming Literally Uninhabitable

Foreign Policy -

One of the regions hardest hit by climate change is also one least equipped to deal with it.

A wildfire which engulfing a Mediterranean resort region on Turkey's southern coast near the town of Manavgat, on July 30, 2021. AFP via Getty Images

Author
is a columnist for Foreign Policy and a freelance TV correspondent and commentator on the Middle East based in Beirut.
This summer, several picturesque countries in the Middle East became tinderboxes. As extreme temperatures and severe droughts ravaged the region, forests burned, and cities became islands of unbearable heat.

In June, Kuwait recorded a temperature of 53.2 degrees Celsius (127.76 degrees Fahrenheit), while Oman, the United Arab Emirates, and Saudi Arabia all recorded over 50 degrees (122 degrees).

A month later, temperatures in Iraq spiked to 51.5 degrees (124.7 degrees), and Iran recorded a close 51 degrees (123.8 degrees).

Worst of all, this is just the start of a trend. The Middle East is warming at twice the global average and by 2050 will be 4 degrees Celsius warmer as compared with the 1.5 degree mark that scientists have prescribed to save humanity.

The World Bank says extreme climatic conditions will become routine and the region could face four months of scorching sun every year. According to Germany’s Max Planck Institute, many cities in the Middle East may literally become uninhabitable before the end of the century. And the region, ravaged by war and mired in sectarianism, may be singularly ill-prepared to face the challenges that threaten its collective existence.

Since the region is split between haves and have-nots, it is the poorer cousins of the oil-rich countries that have been the first to face social disorder over the lack of basic amenities, such as water and electricity, that people desperately need to survive the extreme heat.

These countries are ruled by ineffective governments, autocrats, or clerics and have dilapidated energy infrastructure and deep-rooted structural deficiencies that block the promotion of and technological innovation in renewable energy.

Experts say political and economic reforms that strengthen institutions and promote businesses to think freely are essential to reduce carbon emissions and ensure a shift to clean energy in the Middle East.

Greenhouse gas emissions have more than tripled in the region over the last three decades and caused concern among experts that a steep rise in temperatures on the one hand and lack of basic services on the other are making the region a more desperate and dangerous place.

Jos Lelieveld, an expert on the climate of the Middle East and Mediterranean at the Max Planck Institute, said the Middle East has overtaken the European Union in greenhouse gas emissions even though it is “particularly strongly affected” by climate change.

“In several cities in the Middle East, temperatures have been soaring well in excess of 50 degrees Celsius,” Lelieveld said. “If nothing changes, cities may experience temperatures of 60 degrees Celsius in the future, which will be dangerous for those who do not have access to air conditioning.”

Air conditioners have become a luxury even for the relatively wealthy in countries such as Iran, Iraq, Lebanon, Syria, and Yemen.

These countries are encumbered by war, Western sanctions, or a self-serving ruling elite and have witnessed large protests against a lack of basic services as temperatures rise and droughts parch the fields. The scenes of social unrest have offered a glimpse into the future of the region that most acutely feels the impact of a changing climate.

In Iraq, record-breaking heat last month pushed people onto the streets. They blocked roads, burned tires, and in anger surrounded power plants that had to be secured by armed forces.

Ironically, oil-rich Basra in southern Iraq faces among the longest power outages and has been the epicenter of demonstrations in which at least three Iraqis have been killed. According to experts, political instability is the leading cause behind Iraq’s electricity crisis.

In Lebanon, a similar scenario unfolded this month. The Lebanese are already grappling with myriad crises and are frustrated at the inaction of the political elite. As fuel supply dwindled, scenes of chaos emerged from across the country. Some people looted fuel tankers, others ransacked power plants, and yet more carried firearms to fuel stations to get ahead of hundreds in line.

Power outages lasting three hours had been routine in Lebanon since the civil war ended in 1990. But as the economy collapsed in 2019, blackouts became longer and generators louder, roaring through the country.

On Aug. 12, the central bank lifted subsidies on fuel, and generators ran dry. Lights went off, and even those in affluent neighborhoods—used to air conditioners—had to cope with the sweltering heat.

The local press reported nearly daily skirmishes between people at gas stations that necessitated the presence of the Lebanese army to watch over the distribution and keep peace. In one incident, a confiscated fuel tanker exploded and killed nearly 30 people as the Lebanese army was distributing gasoline. Doctors said the bodies were charred beyond recognition.

The political class in Lebanon has clung to power and refused to usher in reforms to revamp the highly subsidized but loss-making electricity sector.

Experts say Lebanon has massive potential to not only make the enterprise profitable but also deploy those profits to diversify the energy mix and capitalize on ample wind and sun energy. A coherent policy would not only bring respite in piping hot months but also reduce carbon emissions and hence overall global warming.

In 2017, Iran recorded the hottest official temperature in the region of 54 degrees Celsius (129.2 degrees Fahrenheit) and crossed 50 degrees (122 degrees) last month. But recurrent droughts have made the country’s hydroelectricity plants redundant and in turn caused a dip in production at a time when demand for electricity is rising.

In July, different cities in Iran erupted in protests, with some demonstrators chanting “Death to the dictator” and “Death to Khamenei,” in reference to Ayatollah Ali Khamenei, Iran’s supreme leader and the most powerful man in the country.

In Khuzestan province in southwestern Iran, people blocked roads and burned tires to protest water scarcity. At least three protesters were killed allegedly in firing by the state security forces, while human rights activists claim the number to be higher.

Human Rights Watch said “videos shared on social media show security officials using firearms and teargas and shooting toward protesters” and called for the deaths to be investigated. Droughts between 2006 and 2011 in Syria deepened a socioeconomic divide between rural and urban areas and are believed to have been one of the reasons that led to the Syrian civil war. In Yemen, a protracted war seems to have worsened the water crisis.

Yemen’s freshwater underground sources are fast drying, leaving the country parched. Its annual per capita share of water is just 120 cubic meters, compared with the global per capital share of 7,500 cubic meters. Before the war, Yemen’s water ministry had imposed conditions on the drilling of wells, but during the conflict, it was impossible to monitor. Over the last decade, Yemen has fast depleted its already meager freshwater resources.

Johan Schaar, an associate senior fellow at the Stockholm International Peace Research Institute, argues that regional cooperation could mitigate the water crisis and reduce the region’s carbon footprint.

“Most important in terms of regional cooperation is to agree on the use and management of shared water resources that will become more scarce and more variable due to extreme weather events, both rivers and groundwater,” said Schaar, who has an expertise in climate change.

“There are few bilateral transboundary agreements on water and no basinwide agreements for rivers shared by several countries. The water ministers’ council under the Arab League drafted a regional convention on shared water resources a few years ago, but it was never ratified.”

Instead of cooperating on the use of common resources, the region is caught up in conflicts. “None of them have invested more than marginally in reducing [greenhouse gas] emissions,” Schaar said.

“In addition, conflict, instability, and sanctions have consequences for their need and ability to adapt. Conflict leads to displacement and impoverishment of populations, making them more vulnerable to the effects of climate change. Instability shrinks resources and policy space for the long-term planning and investments required for adaptation.”

The connection between climate change and the revolutions and wars of the Arab Spring is hotly debated. But there are clear and unarguable linkages between poor governance, environmental mismanagement, urbanization, and urban unrest in communities poorly served with water, air conditioning, and other amenities.

The thought of what will happen in these cities as climate change worsens living conditions, if the standards of governance remain the same, is a frightening one.

“Climate change and the consequent increase in weather extremes add to the challenges imposed by regional conflicts, leading to additional incentives for people to migrate, for example,” Lelieveld said.

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