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?
International
FBI didn’t think it had cause to raid Trump but DOJ did it anyway
Newly released internal FBI records show that agents themselves doubted they had enough evidence to justify the August 2022 raid on President Trump’s Mar-a-Lago home, but were pushed forward anyway by senior officials inside the Biden Justice Department — a decision that Republican lawmakers now say confirms a grave abuse of federal power.
The documents, made public Tuesday by Senate Judiciary Committee Chairman Chuck Grassley, reveal weeks of internal frustration inside the FBI as agents struggled to establish probable cause that classified material remained at Trump’s Palm Beach estate. In one July 13, 2022 email from the FBI’s Washington Field Office, an official complained that investigators had spent six “counterproductive” weeks chasing a warrant without uncovering any new evidence. “We haven’t generated any new facts, but keep being given draft after draft after draft,” the official wrote, questioning how long the effort could continue without a witness or fresh intelligence to justify a search. Despite those concerns, the DOJ pressed ahead.
Grassley called the disclosures “shocking,” writing on X that the records show the “FBI DID NOT BELIEVE IT HAD PROBABLE CAUSE to raid Pres Trump’s Mar-a-Lago home but Biden DOJ pushed for it anyway.” The Iowa Republican said the emails and memoranda point to a “miscarriage of justice” driven from the top down, not a careful law-enforcement decision grounded in evidence. According to the records, witness interviews conducted after Trump returned classified documents on June 3, 2022 failed to produce proof that sensitive materials were still being concealed at the resort.
Emails exchanged in the week leading up to the Aug. 8 raid show FBI officials actively searching for what they described as a “second path” to obtain a warrant, while also warning about how the operation would look if carried out against a former president. Washington Field Office counterintelligence chief Tony Riedlinger and then-assistant director Steven D’Antuono were included on the discussions, which stressed the need for a “professional, low key” approach and cooperation from Trump attorney Evan Corcoran — a plan that agents cautioned “may not go well at DOJ.” Internal correspondence shows that senior Justice Department officials were unmoved by those concerns. One DOJ official later told colleagues he “frankly [didn’t] give a damn about the optics.”
The records also indicate the DOJ had been preparing for a raid far earlier than previously acknowledged. Emails from early June 2022 show prosecutors wanted a search warrant ready within days of a meeting with Corcoran, anticipating noncompliance and refusing to grant extensions for document production. By July, the scope of the proposed search had expanded dramatically, covering Trump’s office, storage rooms, owner’s quarters, and any other spaces that might have held government records — with only guest rooms explicitly excluded.
When the warrant was finally executed, it bore little resemblance to the restrained operation agents had discussed internally. Trump was not in Florida at the time, having traveled to his Bedminster golf club in New Jersey, leaving behind only a small staff. Dozens of FBI agents arrived with lights and sirens, searched multiple areas of the property, entered Melania Trump’s bedroom, and cracked open a safe in Trump’s office. Agents remained on site for most of the day. Trump condemned the action on Truth Social, calling it unprecedented and unnecessary after months of cooperation. “Nothing like this has ever happened to a President of the United States before,” he wrote.
Attorney General Merrick Garland ultimately approved the raid over objections raised within the FBI. The search later became the foundation for special counsel Jack Smith’s indictment of Trump in June 2023 on multiple counts related to classified documents. That case collapsed when U.S. District Judge Aileen Cannon ruled that Smith had been unlawfully appointed without congressional authorization.
In a cover letter accompanying the document release, FBI Assistant Director Marshall Yates said the bureau was turning over the records in the interest of transparency and restoring public trust. For Grassley and other Republicans, the emails instead reinforce what Trump supporters have argued for years — that the Mar-a-Lago raid was not the product of neutral law enforcement, but a politically driven decision imposed by a Justice Department willing to override its own investigators to target a sitting president’s chief political rival.
Indigenous
Residential school burials controversy continues to fuel wave of church arsons, new data suggests
By Edgardo Sepulveda for Inside Policy
Church arsons surged again in 2024 according to new data released by Statistics Canada—continuing a disturbing trend first uncovered by a Macdonald-Laurier Institute investigation published last year.
Scorched Earth: A quantitative analysis of arson at Canadian religious institutions and its threat to reconciliation, which I published last April, warned that the arson wave – almost certainly spurred by ongoing anger over potential unmarked burials of children at residential schools –would not disappear without concerted government policy intervention.
Unfortunately, my prediction is proving accurate.
Newly available custom data from Statistics Canada confirms that arsons in 2024 continued at nearly double the baseline level established from 2011–17.
This persistent elevation is particularly concerning given that arson is a dangerous crime with significant financial costs and, in the case of religious institutions, broader implications for Canadian society and political discourse. Most importantly for those committed to Indigenous reconciliation, the apparent lack of effective policy response risks undermining public support for reconciliation efforts—suggesting these crimes are not being treated with the seriousness they deserve, particularly because many targets are Catholic churches associated with residential school legacies.
Scorched Earth developed specific terms and a conceptual framework to analyze arsons at religious institutions. First, I refer to “potential unmarked burials” rather than other terminology, including “mass graves” – language suggesting verified remains and, potentially, the site of clandestine burials. Neither has been established. No remains have been verified at any of the 21 announced sites. The Tk’emlúps te Secwépemc First Nation revised its own characterization of the Kamloops, BC, announcements in May 2024 to “probable unmarked burial sites,” a significant shift from its initial May 2021 announcement of “remains of 215 children.” This precipitated announcement, together with some of the initial media coverage in Canada and elsewhere, likely contributed to the intensity of the arson response.
Second, the conceptual framework, updated with the latest Statistics Canada data, separates “baseline” from “excess” arson associated with specific shocks, such as the announcements. It shows that arsons at religious institutions have remained elevated since the initial spike in 2021. Based on careful geographic statistical analysis presented in Scorched Earth, I demonstrated that the most likely explanation for elevated arsons was a criminal response prompted by the 17 announcements of potential unmarked burials at former residential schools, beginning in Kamloops, B.C., in May 2021. Four additional announcements occurred in 2024, bringing the total to 21. While data through 2023 showed no detectable increase in arsons related to the Israel-Gaza conflict, analysis of 2024 data suggests this changed: arsons in response to that conflict now constitute a minority of the increase above baseline levels, with the majority remaining those related to announcements of potential unmarked burials.
Investigation and Prosecution Rates Remain Insufficient for Effective Deterrence
Statistics Canada’s newly released custom clearance data for arson at religious institutions provides the first comprehensive official view of law enforcement effectiveness in these cases, superseding the preliminary compilation included in Scorched Earth.
Crimes in Canada are considered “solved” when police identify a suspect with sufficient evidence to support charges. Cases are then classified as “cleared” through two mechanisms: laying charges (“cleared by charge”) or alternative processes such as diversion programs (“cleared otherwise”).
As Figure 2 illustrates, the cleared-by-charge rate for all arson averaged 13.1 per cent over the 2011–24 period. For religious institutions, the yearly average reached 14.4 per cent—marginally higher but still concerning. The clearance rate for religious institutions shows significant year-over-year variability, reflecting the smaller statistical base compared to all arsons. The “cleared otherwise” category adds an average of 4.7 per cent for both arson types.
While these low clearance rates align with those for other property crimes, the continuing elevated arson rate suggests they provide insufficient deterrence for either first-time or serial arsonists. Evidence from Scorched Earth indicates that sustained clearance rates in the mid-30 per cent range—achieved by the National Church Arson Task Force (NCATF) in the United States during the 1990s—effectively reduced church arsons targeting predominantly Black congregations in the American South.
While my statistical analysis indicates that announcements of potential unmarked burials likely motivated many incidents, this remains circumstantial evidence. Direct evidence would require confessions or explicit statements of rationale from arrested arsonists, or credible claims of responsibility from organized groups. Out of the 306 arsons at religious institutions over the 2021-24 period, 53 resulted in charges and 13 were cleared through alternative processes, totaling 64 cleared incidents—an overall clearance rate of 21 per cent.
A clearance rate at this level, while insufficient for effective deterrence, makes it unlikely that most arsons during this period resulted from organized political, ideological, or anti-religious campaigns. A coordinated campaign would likely be visible to investigators even at this clearance level. Since police identify suspects in far more cases than they prosecute, investigators develop a broader perspective on potential culprits than clearance rates alone suggest. Law enforcement officials have not provided any indication of such organized campaigns.
Federal and Provincial Funding Addresses Searches But Ignores Consequences
Neither federal nor provincial governments have introduced policy initiatives addressing elevated arson rates at religious institutions, despite substantial new funding for related matters.
Following the Kamloops announcement, the federal government launched the Residential Schools Missing Children Community Support program, providing $246 million to hundreds of communities, including for research and field investigations. Separately, British Columbia, Alberta, Ontario, and other provinces have committed hundreds of millions in additional dollars, including programs to address mental health effects from the search process and announcements.
This funding inventory highlights a significant policy gap: substantial resources address the cause—announcements of potential unmarked burials—while none target the effect: arsons at religious institutions.
Even viewed narrowly as a crime issue, recent government responses to other property crimes demonstrate available policy tools. When auto theft peaked in 2023, the federal government announced $121 million in federal support, convened a national summit with all levels of government and law enforcement, and released a National Action Plan by May 2024.
Policy Gaps and a Call to Action
The NCATF, created in response to arsons targeting Black churches in the 1990s United States, achieved clearance rates sufficient to reduce incidents. Canada possesses the same policy tools but has not deployed them for residential school-related arsons.
This is not a matter of capacity or institutional precedent. Recent government responses to other serious property crimes, such as auto theft, demonstrate that Canada can mobilize coordinated federal-provincial action when it chooses to. The apparent policy inaction since 2021 for residential school-related arsons must end.
Canada is not powerless to stop the arsonists. The policy recommendations set out in Scorched Earth continue to be valid:
- Create a national or regional integrated police/fire investigations unit focused specifically on arson at religious institutions. This integrated unit would investigate arsons at all religious institutions—Christian, Muslim, Jewish, and others.
- Improve Indigenous police and fire protection services, including to ensure full Indigenous participation in the integrated unit.
- Complete the long-running project of building and maintaining a comprehensive and timely national and on-reserve database of fire statistics.
Law enforcement officials must thoroughly investigate and prosecute the arsonists. The attacks threaten reconciliation and full Indigenous equality—and they must be condemned by all Canadians.
Economist Edgardo Sepulveda has more than 30 years of experience advising clients in more than forty countries. He has written for Jacobin magazine, TVO Today, and the Alberta Federation of Labour, and has been lead author of three peer-reviewed academic articles in the last five years. He received his BA (Hon) from the University of British Columbia and his MA from Queen’s University, both in Economics. He established Sepulveda Consulting Inc. in 2006.
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