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When black roofs cost more and most negatively affect our health, why are we installing them?

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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?

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Alberta

‘Far too serious for such uninformed, careless journalism’: Complaint filed against Globe and Mail article challenging Alberta’s gender surgery law

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Macdonald-Laurier Institute

Macdonald Laurier Institute challenges Globe article on gender medicine

The complaint, now endorsed by 41 physicians, was filed in response to an article about Alberta’s law restricting gender surgery and hormones for minors.

On June 9, the Macdonald-Laurier Institute submitted a formal complaint to The Globe and Mail regarding its May 29 Morning Update by Danielle Groen, which reported on the Canadian Medical Association’s legal challenge to Alberta’s Bill 26.

Written by MLI Senior Fellow Mia Hughes and signed by 34 Canadian medical professionals at the time of submission to the Globe, the complaint stated that the Morning Update was misleading, ideologically slanted, and in violation the Globe’s own editorial standards of accuracy, fairness, and balance. It objected to the article’s repetition of discredited claims—that puberty blockers are reversible, that they “buy time to think,” and that denying access could lead to suicide—all assertions that have been thoroughly debunked in recent years.

Given the article’s reliance on the World Professional Association for Transgender Health (WPATH), the complaint detailed the collapse of WPATH’s credibility, citing unsealed discovery documents from an Alabama court case and the Cass Review’s conclusion that WPATH’s guidelines—and those based on them—lack developmental rigour. It also noted the newsletter’s failure to mention the growing international shift away from paediatric medical transition in countries such as the UK, Sweden, and Finland. MLI called for the article to be corrected and urged the Globe to uphold its commitment to balanced, evidence-based journalism on this critical issue.

On June 18, Globe and Mail Standards Editor Sandra Martin responded, defending the article as a brief summary that provided a variety of links to offer further context. However, the three Globe and Mail news stories linked to in the article likewise lacked the necessary balance and context. Martin also pointed to a Canadian Paediatric Society (CPS) statement linked to in the newsletter. She argued it provided “sufficient context and qualification”—despite the fact that the CPS itself relies on WPATH’s discredited guidelines. Notwithstanding, Martin claimed the article met editorial standards and that brevity justified the lack of balance.

MLI responded that brevity does not excuse misinformation, particularly on a matter as serious as paediatric medical care, and reiterated the need for the Globe to address the scientific inaccuracies directly. MLI again called for the article to be corrected and for the unsupported suicide claim to be removed. As of this writing, the Globe has not responded.

Letter of complaint

June 9, 2025

To: The Globe and Mail
Attn: Sandra Martin, standards editor
CC: Caroline Alphonso, health editor; Mark Iype, deputy national editor and Alberta bureau chief

To the editors;

Your May 29 Morning Update: The Politics of Care by Danielle Groen, covering the Canadian Medical Association’s legal challenge to Alberta’s Bill 26, was misleading and ideologically slanted. It is journalistically irresponsible to report on contested medical claims as undisputed fact.

This issue is far too serious for such uninformed, careless journalism lacking vital perspectives and scientific context. At stake is the health and future of vulnerable children, and your reporting risks misleading parents into consenting to irreversible interventions based on misinformation.

According to The Globe and Mail’s own Journalistic Principles outlined in its Editorial Code of Conduct, the credibility of your reporting rests on “solid research, clear, intelligent writing, and maintaining a reputation for honesty, accuracy, fairness, balance and transparency.” Moreover, your principles go on to state that The Globe will “seek to provide reasonable accounts of competing views in any controversy.” The May 29 update violated these principles. There is, as I will show, a widely available body of scientific information that directly contests the claims and perspectives presented in your article. Yet this information is completely absent from your reporting.

The collapse of WPATH’s credibility

The article’s claim that Alberta’s law “falls well outside established medical practice” and could pose the “greatest threat” to transgender youth is both false and inflammatory. There is no global medical consensus on how to treat gender-distressed young people. In fact, in North America, guidelines are based on the Standards of Care developed by the World Professional Association for Transgender Health (WPATH)—an organization now indisputably shown to place ideology above evidence.

For example, in a U.S. legal case over Alabama’s youth transition ban, WPATH was forced to disclose over two million internal emails. These revealed the organization commissioned independent evidence reviews for its latest Standards of Care (SOC8)—then suppressed those reviews when they found overwhelmingly low-quality evidence. Yet WPATH proceeded to publish the SOC8 as if it were evidence-based. This is not science. It is fraudulent and unethical conduct.

These emails also showed Admiral Rachel Levine—then-assistant secretary for Health in the Biden administration—pressured WPATH to remove all lower age recommendations from the guidelines—not on scientific grounds, but to avoid undermining ongoing legal cases at the state level. This is politics, not sound medical practice.

The U.K.’s Cass Review, a major multi-year investigation, included a systematic review of the guidelines in gender medicine. A systematic review is considered the gold standard because it assesses and synthesizes all the available research in a field, thereby reducing bias and providing a large comprehensive set of data upon which to reach findings. The systematic review of gender medicine guidelines concluded that WPATH’s standards of care “lack developmental rigour” and should not be used as a basis for clinical practice. The Cass Review also exposed citation laundering where medical associations endlessly recycled weak evidence across interlocking guidelines to fabricate a false consensus. This led Cass to suggest that “the circularity of this approach may explain why there has been an apparent consensus on key areas of practice despite the evidence being poor.”

Countries like SwedenFinland, and the U.K. have now abandoned WPATH and limited or halted medicalized youth transitions in favour of a therapy-first approach. In Norway, UKOM, an independent government health agency, has made similar recommendations. This shows the direction of global practice is moving away from WPATH’s medicalized approach—not toward it. As part of any serious effort to “provide reasonable accounts of competing views,” your reporting should acknowledge these developments.

Any journalist who cites WPATH as a credible authority on paediatric gender medicine—especially in the absence of contextualizing or competing views—signals a lack of due diligence and a fundamental misunderstanding of the field. It demonstrates that either no independent research was undertaken, or it was ignored despite your editorial standards.

Puberty blockers don’t ‘buy time’ and are not reversible

Your article repeats a widely debunked claim: that puberty blockers are a harmless pause to allow young people time to explore their identity. In fact, studies have consistently shown that between 98 per cent and 100 per cent of children placed on puberty blockers go on to take cross-sex hormones. Before puberty blockers, most children desisted and reconciled with their birth sex during or after puberty. Now, virtually none do.

This strongly suggests that blocking puberty in fact prevents the natural resolution of gender distress. Therefore, the most accurate and up-to-date understanding is that puberty blockers function not as a pause, but as the first step in a treatment continuum involving irreversible cross-sex hormones. Indeed, a 2022 paper found that while puberty suppression had been “justified by claims that it was reversible … these claims are increasingly implausible.” Again, adherence to the Globe’s own editorial guidelines would require, at minimum, the acknowledgement of the above findings alongside the claims your May 29 article makes.

Moreover, it is categorically false to describe puberty blockers as “completely reversible.” Besides locking youth into a pathway of further medicalization, puberty blockers pose serious physical risks: loss of bone densityimpaired sexual developmentstunted fertility, and psychosocial harm from being developmentally out of sync with peers. There are no long-term safety studies. These drugs are being prescribed to children despite glaring gaps in our understanding of their long-term effects.

Given the Globe’s stated editorial commitment to principles such as “accuracy,” the crucial information from the studies linked above should be provided in any article discussing puberty blockers. At a bare minimum, in adherence to the Globe’s commitment to “balance,” this information should be included alongside the contentious and disputed claims the article makes that these treatments are reversible.

No proof of suicide prevention

The most irresponsible and dangerous claim in your article is that denying access to puberty blockers could lead to “depression, self-harm and suicide.” There is no robust evidence supporting this transition-or-suicide narrative, and in fact, the findings of the highest-quality study conducted to date found no evidence that puberty suppression reduces suicide risk.

Suicide is complex and attributing it to a single cause is not only false—it violates all established suicide reporting guidelines. Sensationalized claims like this risk creating contagion effects and fuelling panic. In the public interest, reporting on the topic of suicide must be held to the most rigorous standards, and provide the most high-quality and accurate information.

Euphemism hides medical harm

Your use of euphemistic language obscures the extreme nature of the medical interventions being performed in gender clinics. Calling double mastectomies for teenage girls “paediatric breast surgeries for gender-affirming reasons” sanitizes the medically unnecessary removal of a child’s healthy organs. Referring to phalloplasty and vaginoplasty as “gender-affirming surgeries on lower body parts” conceals the fact that these are extreme operations involving permanent disfigurement, high complication rates, and often requiring multiple revisions.

Honest journalism should not hide these facts behind comforting language. Your reporting denies youth, their parents, and the general public the necessary information to understand the nature of these interventions. Members of the general public rely greatly on the news media to equip them with such information, and your own editorial standards claim you will fulfill this core responsibility.

Your responsibility to the public

As a flagship Canadian news outlet, your responsibility is not to amplify activist messaging, but to report the truth with integrity. On a subject as medically and ethically fraught as paediatric gender medicine, accuracy is not optional. The public depends on you to scrutinize claims, not echo ideology. Parents may make irreversible decisions on behalf of their children based on the narratives you promote. When reporting is false or ideologically distorted, the cost is measured in real-world harm to some of our society’s most vulnerable young people.

I encourage the Globe and Mail to publish an updated version on this article in order to correct the public record with the relevant information discussed above, and to modify your reporting practices on this matter going forward—by meeting your own journalistic standards—so that the public receives balanced, correct, and reliable information on this vital topic.

Trustworthy journalism is a cornerstone of public health—and on the issue of paediatric gender medicine, the stakes could not be higher.

Sincerely,

Mia Hughes
Senior Fellow, Macdonald-Laurier Institute
Author of The WPATH Files

The following 41 physicians have signed to endorse this letter:
Dr. Mike Ackermann, MD
Dr. Duncan Veasey, Psy MD
Dr. Rick Gibson, MD
Dr. Benjamin Turner, MD, FRCSC
Dr. J.N. Mahy, MD, FRCSC, FACS
Dr. Khai T. Phan, MD, CCFP
Dr. Martha Fulford, MD
Dr. J. Edward Les, MD, FRCPC
Dr. Darrell Palmer, MD, FRCPC
Dr. Jane Cassie, MD, FRCPC
Dr. David Lowen, MD, FCFP
Dr. Shawn Whatley, MD, FCFP (EM)
Dr. David Zitner, MD
Dr. Leonora Regenstreif, MD, CCFP(AM), FCFP
Dr. Gregory Chan, MD
Dr. Alanna Fitzpatrick, MD, FRCSC
Dr. Chris Millburn, MD, CCFP
Dr. Julie Curwin, MD, FRCPC
Dr. Roy Eappen, MD, MDCM, FRCP (c)
Dr. York N. Hsiang, MD, FRCSC
Dr. Dion Davidson, MD, FRCSC, FACS
Dr. Kevin Sclater, MD, CCFP (PC)
Dr. Theresa Szezepaniak, MB, ChB, DRCOG
Dr. Sofia Bayfield, MD, CCFP
Dr. Elizabeth Henry, MD, CCFP
Dr. Stephen Malthouse, MD
Dr. Darrell Hamm, MD, CCFP
Dr. Dale Classen, MD, FRCSC
Dr. Adam T. Gorner, MD, CCFP
Dr. Wesley B. Steed, MD
Dr. Timothy Ehmann, MD, FRCPC
Dr. Ryan Torrie, MD
Dr. Zachary Heinricks, MD, CCFP
Dr. Jessica Shintani, MD, CCFP
Dr. Mark D’Souza, MD, CCFP(EM), FCFP*
Dr. Joanne Sinai, MD, FRCPC*
Dr. Jane Batt, MD*
Dr. Brent McGrath, MD, FRCPC*
Dr. Leslie MacMillan MD FRCPC (emeritus)*
Dr. Ian Mitchell, MD, FRCPC*
Dr. John Cunnington, MD

*Indicates physician who signed following the letter’s June 9 submission to the Globe and Mail, but in advance of this letter being published on the MLI website.

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Automotive

Federal government should swiftly axe foolish EV mandate

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From the Fraser Institute

By Kenneth P. Green

Two recent events exemplify the fundamental irrationality that is Canada’s electric vehicle (EV) policy.

First, the Carney government re-committed to Justin Trudeau’s EV transition mandate that by 2035 all (that’s 100 per cent) of new car sales in Canada consist of “zero emission vehicles” including battery EVs, plug-in hybrid EVs and fuel-cell powered vehicles (which are virtually non-existent in today’s market). This policy has been a foolish idea since inception. The mass of car-buyers in Canada showed little desire to buy them in 2022, when the government announced the plan, and they still don’t want them.

Second, President Trump’s “Big Beautiful” budget bill has slashed taxpayer subsidies for buying new and used EVs, ended federal support for EV charging stations, and limited the ability of states to use fuel standards to force EVs onto the sales lot. Of course, Canada should not craft policy to simply match U.S. policy, but in light of policy changes south of the border Canadian policymakers would be wise to give their own EV policies a rethink.

And in this case, a rethink—that is, scrapping Ottawa’s mandate—would only benefit most Canadians. Indeed, most Canadians disapprove of the mandate; most do not want to buy EVs; most can’t afford to buy EVs (which are more expensive than traditional internal combustion vehicles and more expensive to insure and repair); and if they do manage to swing the cost of an EV, most will likely find it difficult to find public charging stations.

Also, consider this. Globally, the mining sector likely lacks the ability to keep up with the supply of metals needed to produce EVs and satisfy government mandates like we have in Canada, potentially further driving up production costs and ultimately sticker prices.

Finally, if you’re worried about losing the climate and environmental benefits of an EV transition, you should, well, not worry that much. The benefits of vehicle electrification for climate/environmental risk reduction have been oversold. In some circumstances EVs can help reduce GHG emissions—in others, they can make them worse. It depends on the fuel used to generate electricity used to charge them. And EVs have environmental negatives of their own—their fancy tires cause a lot of fine particulate pollution, one of the more harmful types of air pollution that can affect our health. And when they burst into flames (which they do with disturbing regularity) they spew toxic metals and plastics into the air with abandon.

So, to sum up in point form. Prime Minister Carney’s government has re-upped its commitment to the Trudeau-era 2035 EV mandate even while Canadians have shown for years that most don’t want to buy them. EVs don’t provide meaningful environmental benefits. They represent the worst of public policy (picking winning or losing technologies in mass markets). They are unjust (tax-robbing people who can’t afford them to subsidize those who can). And taxpayer-funded “investments” in EVs and EV-battery technology will likely be wasted in light of the diminishing U.S. market for Canadian EV tech.

If ever there was a policy so justifiably axed on its failed merits, it’s Ottawa’s EV mandate. Hopefully, the pragmatists we’ve heard much about since Carney’s election victory will acknowledge EV reality.

Kenneth P. Green

Senior Fellow, Fraser Institute
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