Opinion
When black roofs cost more and most negatively affect our health, why are we installing them?
We are into construction season and summer and the heat is starting to be an issue. We will have some heat waves and we will notice the “Urban Heat Island Effect”.
The city will seem hotter than the county, but we will also notice differences in temperature between light coloured vehicles and darker coloured vehicles, and even the coolness of a white fence.
During heat waves some of the most vulnerable people are those living on the top floor of a building with a black roof.
My biggest question is why are we still putting black roofs on our buildings? Black roofs do not absorb heat in the winter under a foot of white snow. They absorb heat during the hot days making it hotter.
Let’s start at the beginning, by hitting the Google button.
What is the Heat Island Effect?
The elevated temperature in urban areas as compared to rural, less developed areas is referred to as the urban heat island effect. As cities grow and develop, more buildings and people are added. The process of urban development leads to this phenomenon.
What are the Implications of Heat Islands?
Heat islands are considered a form of local climate change as opposed to global climate change. The effects of heat islands are confined to specific areas, and do not have a larger impact on climate change. Despite being confined to a certain locality, heat islands can still make a significant impact.
Of course, one of the most noticeable impacts on urban dwellers is an increase in hot, summer weather. On particularly clear and hot days, when the heat island effect is at its worst, inhabitants of larger cities will notice hotter and more uncomfortable temperatures. When people are hot, they often crank up their air conditioners. Increases in air conditioning use not only results in more heat being released into the air, this also contributes to air pollution, as more greenhouse gas emissions are discharged. This negatively impacts air quality and can also lead to a surge in urban smog.
How Can We Reduce the Heat Island?
Since the impact of heat islands is mostly negative, scientists and researchers are searching for ways to reduce and reverse the effects. Dark roof surfaces are one of the major culprits of temperature increases. One popular technique for combating the heat island effect is installing green roofs on urban buildings. Green roofs, which are lined with soil and certain types of vegetation, can actually help cities regain some of the cooling and evaporative effects that the natural landscape once provided. As this idea becomes more popular, there is more and more scientific evidence that green roofs can reduce heat in urban areas.
Dark building surfaces that absorb more heat account for some of the rising temperatures in urban areas. One simple method for reducing this effect is to paint buildings with light or white colors that do not absorb nearly as much heat. Some cities are also using paint treatments that reflect light to combat the heat island effect. White, Green or Black Roofs? Berkeley Lab Report Compares Economic Payoffs
Looking strictly at the economic costs and benefits of three different roof types—black, white and “green” (or vegetated)—Lawrence Berkeley National Laboratory (Berkeley Lab) researchers have found in a new study that white roofs are the most cost-effective over a 50-year time span. While the high installation cost of green roofs sets them back in economic terms, their environmental and amenity benefits may at least partially mitigate their financial burden.
A new report titled “Economic Comparison of White, Green, and Black Flat Roofs in the United States” by Julian Sproul, Benjamin Mandel, and Arthur Rosenfeld of Berkeley Lab, and Man Pun Wan of Nanyang Technological University in Singapore, provides a direct economic comparison of these three roof types. The study will appear in the March 2014 volume of Energy and Buildings and has just been published online. “White roofs win based on the purely economic factors we included, and black roofs should be phased out,” said study co-author Rosenfeld, a Berkeley Lab Distinguished Scientist Emeritus and former Commissioner of the California Energy Commission
The study analyzes 22 commercial flat roof projects in the United States in which two or more roof types were considered. The researchers conducted a 50-year life cycle cost analysis, assuming a 20-year service life for white and black roofs and a 40-year service life for green roofs.
A green roof, often called vegetated roofs or rooftop gardens, has become an increasingly popular choice for aesthetic and environmental reasons. Rosenfeld acknowledges that their economic analysis does not capture all of the benefits of a green roof. For example rooftop gardens provide storm water management, an appreciable benefit in cities with sewage overflow issues, while helping to cool the roof’s surface as well as the air. Green roofs may also give building occupants the opportunity to enjoy green space where they live or work.
Berkeley Lab Distinguished Scientist Emeritus Art Rosenfeld
“We leave open the possibility that other factors may make green roofs more attractive or more beneficial options in certain scenarios,” said Mandel, a graduate student researcher at Berkeley Lab. “The relative costs and benefits do vary by circumstance.”
However, unlike white roofs, green roofs do not offset climate change. White roofs are more reflective than green roofs, reflecting roughly three times more sunlight back into the atmosphere and therefore absorbing less sunlight at earth’s surface. By absorbing less sunlight than either green or black roofs, white roofs offset a portion of the warming effect from greenhouse gas emissions.
“Both white and green roofs do a good job at cooling the building and cooling the air in the city, but white roofs are three times more effective at countering climate change than green roofs,” said Rosenfeld.
White roofs are most cost-effective
The costs and benefits difference stack that has the highest net present value shows the roof type that is most cost-effective.
The 50-year life-cycle cost analysis found that even the most inexpensive kind of green roof (with no public access and consisting of only sedum, or prairie grass) costs $7 per square foot more than black roofs over 50 years, while white roofs save $2 per square foot compared to black roofs. In other words, white roofs cost $9 per square foot less than green roofs over 50 years, or $0.30 per square foot each year.
The researchers acknowledge that their data are somewhat sparse but contend that their analysis is valuable in that it is the first to compare the economic costs and energy savings benefits of all three roof types. “When we started the study it wasn’t obvious that white roofs would still be more cost-effective over the long run, taking into account the longer service time of a green roof,” Mandel said.
Furthermore while the economic results are interesting, it also highlights the need to include factors such health and environment in a more comprehensive analysis. “We’ve recognized the limitations of an analysis that’s only economic,” Mandel said. “We would want to include these other factors in any future study.”
Black roofs pose health risk
For example, black roofs pose a major health risk in cities that see high temperatures in the summer. “In Chicago’s July 1995 heat wave a major risk factor in mortality was living on the top floor of a building with a black roof,” Rosenfeld said.
For that reason, he believes this latest study points out the importance of government policymaking. “White doesn’t win out over black by that much in economic terms, so government has a role to ban or phase out the use of black or dark roofs, at least in warm climates, because they pose a large negative health risk,” he said.
Rosenfeld, who started at Berkeley Lab in the 1950s, is often called California’s godfather of energy efficiency for his pioneering work in the area. He was awarded a National Medal of Technology and Innovation by President Obama in 2012, one of the nation’s highest honours.
Rosenfeld has been a supporter of solar-reflective “cool” roofs, including white roofs, as a way to reduce energy costs and address global warming. He was the co-author of a 2009 study in which it was estimated that making roofs and pavements around the world more reflective could offset 44 billion tons of CO2 emissions. A later study using a global land surface model found similar results: cool roofs could offset the emissions of roughly 300 million cars for 20 years.
So if black roofs are detrimental to our health, contribute to the issue of Urban Heat Island Effect and costs more, why are we still building black roofs?
Education
Why classroom size isn’t the issue teacher unions think it is
This article supplied by Troy Media.
The real challenge is managing classrooms with wide-ranging student needs, from special education to language barriers
Teachers’ unions have long pushed for smaller class sizes, but the real challenge in schools isn’t how many students are in the room—it’s how complex those classrooms have become. A class with a high proportion of special needs students, a wide range of academic levels or several students learning English as a second language can be far more difficult to teach than a larger class
where students are functioning at a similar level.
Earlier this year, for example, the Elementary Teachers’ Federation of Ontario announced that smaller class sizes would be its top bargaining priority in this fall’s negotiations.
It’s not hard to see why unions want smaller classes. Teaching fewer students is generally easier than teaching more students, which reduces the workload of teachers. In addition, smaller classes require hiring more teachers, and this amounts to a significant financial gain for teachers’ unions. Each teacher pays union dues as part of membership.
However, there are good reasons to question the emphasis on class size. To begin with, reducing class size is prohibitively expensive. Teacher salaries make up the largest percentage of education spending, and hiring more teachers will significantly increase the amount of money spent on salaries.
Now, this money could be well spent if it led to a dramatic increase in student learning. But it likely wouldn’t. That’s because while research shows that smaller class sizes have a moderately beneficial impact on the academic performance of early years students, there is little evidence of a similar benefit for older students. Plus, to get a significant academic benefit, class sizes need to be reduced to 17 students or fewer, and this is simply not financially feasible.
In addition, not only does reducing class sizes mean spending more money on teacher compensation (including salaries, pensions and benefits), but it also leads to a decline in average teacher experience and qualifications, particularly during teacher shortages.
As a case in point, when the state of California implemented a K-3 class-size reduction program in 1996, inexperienced or uncertified teachers were hired to fill many of the new teaching positions. In the end, California spent a large amount of money for little measurable improvement in academic performance. Ontario, or any other province, would risk repeating California’s costly experience.
Besides, anyone with a reasonable amount of teaching experience knows that classroom complexity is a much more important issue than class size. Smaller classes with a high percentage of special needs students are considerably more difficult to teach than larger classes where students all function at a similar academic level.
The good news is that some teachers’ unions have shifted their focus from class size to classroom complexity. For example, during the recent labour dispute between the Saskatchewan Teachers’ Federation (STF) and the Saskatchewan government, the STF demanded that a classroom complexity article be included in the provincial collective agreement. After the dispute went to binding arbitration, the arbitrator agreed with the STF’s request.
Consequently, Saskatchewan’s new collective agreement states, among other things, that schools with 150 or more students will receive an additional full-time teacher who can be used to provide extra support to students with complex needs. This means that an extra 500 teachers will be hired across Saskatchewan.
While this is obviously a significant expenditure, it is considerably more affordable than arbitrarily reducing class sizes across the province. By making classroom complexity its primary focus, the STF has taken an important first step because the issue of classroom complexity isn’t going away.
Obviously, Saskatchewan’s new collective agreement is far from a panacea, because there is no guarantee that principals will make the most efficient use of these additional teachers.
Nevertheless, there are potential benefits that could come from this new collective agreement. By getting classroom complexity into the collective agreement, the STF has ensured that this issue will be on the table for the next round of bargaining. This could lead to policy changes that go beyond hiring a few additional teachers.
Specifically, it might be time to re-examine the wholesale adoption of placing most students, including those with special needs, in regular classrooms, since this policy is largely driving the increase in diverse student needs. While every child has the right to an education, there’s no need for this education to look the same for everyone. Although most students benefit from being part of regular academic classes, some students would learn better in a different setting that takes their individual needs into consideration.
Teachers across Canada should be grateful that the STF has taken a step in the right direction by moving beyond the simplistic demand for smaller class sizes by focusing instead on the more important issue of diverse student needs.
Michael Zwaagstra is a senior fellow with the Frontier Centre for Public Policy.
Troy Media empowers Canadian community news outlets by providing independent, insightful analysis and commentary. Our mission is to support local media in helping Canadians stay informed and engaged by delivering reliable content that strengthens community connections and deepens understanding across the country
Addictions
Canadian gov’t not stopping drug injection sites from being set up near schools, daycares
From LifeSiteNews
Canada’s health department told MPs there is not a minimum distance requirement between safe consumption sites and schools, daycares or playgrounds.
So-called “safe” drug injection sites do not require a minimum distance from schools, daycares, or even playgrounds, Health Canada has stated, and that has puzzled some MPs.
Canadian Health Minister Marjorie Michel recently told MPs that it was not up to the federal government to make rules around where drug use sites could be located.
“Health Canada does not set a minimum distance requirement between safe consumption sites and nearby locations such as schools, daycares or playgrounds,” the health department wrote in a submission to the House of Commons health committee.
“Nor does the department collect or maintain a comprehensive list of addresses for these facilities in Canada.”
Records show that there are 31 such “safe” injection sites allowed under the Controlled Drugs And Substances Act in six Canadian provinces. There are 13 are in Ontario, five each in Alberta, Quebec, and British Columbia, and two in Saskatchewan and one in Nova Scotia.
The department noted, as per Blacklock’s Reporter, that it considers the location of each site before approving it, including “expressions of community support or opposition.”
Michel had earlier told the committee that it was not her job to decide where such sites are located, saying, “This does not fall directly under my responsibility.”
Conservative MP Dan Mazier had asked for limits on where such “safe” injection drug sites would be placed, asking Michel in a recent committee meeting, “Do you personally review the applications before they’re approved?”
Michel said that “(a)pplications are reviewed by the department.”
Mazier stated, “Are you aware your department is approving supervised consumption sites next to daycares, schools and playgrounds?”
Michel said, “Supervised consumption sites were created to prevent overdose deaths.”
Mazier continued to press Michel, asking her how many “supervised consumption sites approved by your department are next to daycares.”
“I couldn’t tell you exactly how many,” Michel replied.
Mazier was mum on whether or not her department would commit to not approving such sites near schools, playgrounds, or daycares.
An injection site in Montreal, which opened in 2024, is located close to a kindergarten playground.
Conservative Party leader Pierre Poilievre has called such sites “drug dens” and has blasted them as not being “safe” and “disasters.”
Records show that the Liberal government has spent approximately $820 million from 2017 to 2022 on its Canadian Drugs and Substances Strategy. However, even Canada’s own Department of Health admitted in a 2023 report that the Liberals’ drug program only had “minimal” results.
Recently, LifeSiteNews reported that the British Columbia government decided to stop a so-called “safe supply” free drug program in light of a report revealing many of the hard drugs distributed via pharmacies were resold on the black market.
British Columbia Premier David Eby recently admitted that allowing the decriminalization of hard drugs in British Columbia via a federal pilot program was a mistake.
Former Prime Minister Justin Trudeau’s loose drug initiatives were deemed such a disaster in British Columbia that Eby’s government asked Trudeau to re-criminalize narcotic use in public spaces, a request that was granted.
Official figures show that overdoses went up during the decriminalization trial, with 3,313 deaths over 15 months, compared with 2,843 in the same time frame before drugs were temporarily legalized.
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