Enemies of Energy: Sierra Club

Editor’s note: The following is an excerpt from Enemies of Energy, a research report created for the Capital Research Center. The page for the full report is here: Enemies of Energy.

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Founded in 1892 by naturalist John Muir and his allies to protect the boundaries of Yosemite National Park, the Sierra Club is one of America’s original conservationist nonprofits and for a long time the most influential. Sierra deserves partial credit for the establishment of some of our oldest national parks, a badge of honor few if any other modern American NGOs can claim. [i]

The Sierra Club is a 501(c)(4) advocacy nonprofit that is affiliated with the Sierra Club Foundation, a 501(c)(3) educational nonprofit, and Sierra Club Independent Action, a political committee. In the IRS filing covering 2024 the Sierra Club reported revenue of $169 million. ^[ii]

The latest publicly available IRS filings show the combined net assets of the Sierra Club advocacy and educational nonprofits to be $291.9 million. (Unusual among the richest anti-energy NGOs, Sierra lists large net assets parked in both its advocacy and educational nonprofits, which is why they were combined for this analysis.) [iii] ^[iv]

Today’s Sierra Club has drifted a long way from the conservation-focused mission described above. One hint is the image on the “About the Sierra Club” webpage that is used to depict the NGO’s “4,500 rallies and events.” It is a picture of protesters holding Sierra-branded signs about … gender equity. [v]

A lot of this behavior may be driven by the Progressive Workers Union (PWU), a radical-left labor union that represents more than 500 employees at left-wing NGOs. It was started at the Sierra Club in 1992 and represents more than 300 workers there. ^[vi]

A good example of the PWU agenda was a June 2023 vote in favor of a resolution denouncing “Israel’s oppressive apartheid rule” of the “Palestinian People.” The resolution was supported by 86 percent of the Sierra Club’s PWU members who voted on it. The vote followed a decision by the Sierra Club to reinstate its educational trips to Israel, despite the PWU’s opposition to same. ^[vii]

Anti-energy evolution

Time magazine reported “that between 2007 and 2010 the Sierra Club accepted over $25 million in donations from the gas industry, mostly from Aubrey McClendon, CEO of Chesapeake Energy—one of the biggest gas drilling companies in the U.S. and a firm heavily involved in fracking—to help fund the Club’s Beyond Coal campaign.”

For most of its long history the Sierra Club wasn’t so radical and could not be easily pigeonholed as an anti-energy NGO.

In 1966 the Sierra Club board voted 9-1 to support construction of California’s Diablo Canyon nuclear power station. Pacific Gas & Electric had previously hoped to build the plant on Nipomo Dunes, a site the Sierra Club opposed for conservation reasons. PG&E and representatives from the Sierra Club took this as an opportunity to reason together, rather than fight, and compromised on the Diablo Canyon site instead. [viii]

William Siri was the Sierra Club board president during the 1966 vote and was a supporter of nuclear power. A biophysicist who studied radiation, Siri defended the Diablo vote, arguing that “we are an energy-based society” and that “consumption of energy has for decades accurately followed projections of need and nothing short of world-wide disaster could alter the growing power needs of the nation.” ^{[ix] [x]}

Under Siri’s leadership, Sierra was not an anti-energy group.

But today, the NGO’s website proclaims that the “Sierra Club remains unequivocally opposed to nuclear energy.” Following that introduction, the Sierra Club’s “Nuclear Free Future” web page adds this conventional and scientifically illiterate scaremongering: [xi]

Besides reactor safety, both nuclear proliferation and the required long-term storage of nuclear waste (which remains lethal for more than 100,000 years) make nuclear power a uniquely dangerous energy technology for humanity.  Nuclear is no solution to Climate Change and every dollar spent on nuclear is one less dollar spent on truly safe, affordable and renewable energy sources.  Help us work to phase out nuclear as quickly as possible.^[xii]

The 1966 vote to approve the Diablo Canyon compromise touched off what Siri later referred to as a “civil war” within the Sierra Club. An anti-Diablo board was elected in 1968, and by 1979 the Sierra Club had voted to oppose all new nuclear power and even rescind its support for Diablo Canyon. ^[xiii]

One of Siri’s allies on the Sierra Club board was legendary nature photographer Ansel Adams, who argued the Diablo deal was an example of “constructive cooperation” between conservationists and industry. Later in the 1980s Adams told an interviewer that “nuclear energy is the future,” the “only practical alternative that we have to destroying the environment with oil and coal,” and that “you are at infinitely more risk driving around in your car than you are around any nuclear plant.” ^[xiv] [xv]

By that point Adams was no longer on the Sierra Club board. Today the profile page for him on the Sierra Club website does not mention the Diablo controversy and his support for nuclear power. [xvi]

A prominent voice on the other side was David Brower, longtime executive director of the Sierra Club. By his own admission, Brower had been “pro-nuclear for twenty-three years.” But during the Diablo dispute, Brower morphed into a “born-again anti-nuclearist.” He resigned in May 1969 and went off to form another anti-energy NGO: Friends of the Earth. In his final speech, Brower denounced America’s “addiction to growth,” foreshadowing today’s anti-energy Sierra Club. ^[xvii]

The “constructive cooperation” with the energy industry that Ansel Adams championed for the Sierra Club later became hypocritical cooperation.

“The national Sierra Club is one of natural gas’s biggest boosters,” reported the Wall Street Journal, in December 2009. “Carl Pope, the Sierra Club’s executive director, has traveled the country promoting natural gas’s environmental benefits, sometimes alongside Aubrey McClendon, chief executive of Chesapeake Energy Corp., one of the biggest U.S. gas companies by production.” [xviii]

The Journal further explained: “Some activists, such as Mr. Pope, believe increased drilling — with appropriate safeguards — is the best way to wean the U.S. off coal, which they see as the greater environmental threat.” ^[xix]

The sincerity of this claim was obliterated in 2012, when Time magazine reported “that between 2007 and 2010 the Sierra Club accepted over $25 million in donations from the gas industry, mostly from Aubrey McClendon, CEO of Chesapeake Energy—one of the biggest gas drilling companies in the U.S. and a firm heavily involved in fracking—to help fund the Club’s Beyond Coal campaign.” [xx]

Michael Brune replaced Carl Pope as the Sierra Club executive director in 2010. The Time report noted that fracking “wasn’t really on the environmental radar” when Sierra was taking the loot from Chesapeake. Even Al Gore, in his 2000 presidential campaign, pledged to “promote expanded exploration for cleaner burning natural gas.” ^[xxi] [xxii]

But a lot had changed by 2012. Fracking was turning America into a natural gas superpower and, not coincidentally, the burgeoning anti-energy movement—Al Gore included—was turning against gas. “It’s time to stop thinking of natural gas as a ‘kinder, gentler’ energy source,” wrote Michael Brune on the Sierra Club website, hours after the Time report posted. ^[xxiii]

Sierra has since added a “Beyond Gas” campaign to the “Beyond Coal” effort that was funded by the natural gas industry. “‘Natural gas’ is what the fossil fuel industry calls methane gas to make it sound safer for the environment and our health,” claims the Sierra Club today, conveniently forgetting their recent public relations with and financial support from the “fossil fuel industry.” [xxiv] [xxv]

Like all anti-energy NGOs, the only energy production Sierra supports now is that which comes from weather dependent, unreliable, wind turbines and solar panels.

This too produces moments of comical irony. A January 13, 2026, Sierra Club news release praised a wind energy project in the ocean off Rhode Island as a source of “steady, affordable energy.” Exactly two weeks later another Sierra news release blasted the Trump administration for “trying to sell out our coastal communities and our public waters” by expanding offshore oil and natural gas drilling leases. “These lease sales are privatization in everything but name,” claimed Sierra Club executive director Loren Blackford, who failed to note whether leasing the ocean to a Big Wind corporation is also privatization. [xxvi]

The turmoil years

The conservation movement might not have evolved into an anti-energy movement if the Sierra Club had stuck to the sense of purpose they had at their founding.

Ms. Blackford was permanently appointed executive director in September 2025, after holding the post on an interim basis since August 2025. A long-time official with Sierra Club, Blackford became the fourth person within four years to hold the post, following yet another period of turmoil at the Sierra Club. ^[xxvii]

In August 2021, the findings of a damning report from an independent consulting firm commissioned by the Sierra Club was leaked. The investigation was launched in September 2020, following a rape allegation against a prominent figure at the NGO. Politico quoted from the report’s findings: [xxviii]

“One of the most prevalent themes we heard was that there was generally a culture at the Sierra Club that tolerated, excused, or failed to correct those managers and leaders who regularly displayed anger and aggression — yelling, berating, shaming, and otherwise demonstrating unprofessional and abusive behavior in the workplace,” the executive summary said. “It became clear that many of these individuals were well-known for engaging in this behavior and that nothing was done to meaningfully curb the behavior.”^[xxix]

A former employee from the era told E&E News that too many employees from the “social justice warrior segment” had made the Sierra Club “an intolerable hothouse” and toxic work environment. ^[xxx]

The Sierra Club’s executive director, Michael Brune, resigned in August 2021 after 11 years on the job. The Sierra Club news release that announced this departure did not mention the existence of the still-secret investigation but did name two people to fill in for Brune on an interim basis. Less than a week later, Politico broke the story about the internal investigation. [xxxi]

In January 2023 Sierra named Ben Jealous as the new executive director. Widely described as the first “person of color” to lead the NGO, Jealous had been the president of the left-wing activist group People for the American Way, and before that president of the NAACP.^[xxxii]

But this didn’t work out either. In August 2025, the Sierra board fired Jealous for cause after an “extensive evaluation of his conduct.” No specific details were officially provided by the Sierra Club.[xxxiii]

Shortly afterward, Bloomberg and E&E News separately reported that a sexual harassment complaint had been made against Jealous. Then in April 2026 a sexual harassment lawsuit was filed by a former direct report of Jealous. The Sierra Club has maintained radio silence regarding the specific reason for the termination, citing the legal proceeding, but noting that “we handled the matter with sensitivity and care, in line with our values, policies, and the law.” Jealous responded to the firing and the allegations by denying them and accusing his former employer of “racial retaliation” and “personal attacks.” [xxxiv]

A former Sierra Club board member (not involved in the decision to fire Jealous) said the firing “smells of retaliation” because it occurred right after Jealous had filed “a very lengthy complaint of harassment” against members of Sierra’s executive committee. Similarly, Al Sharpton warned the world that the firing of Jealous might lead to “serious racial implications.” ^[xxxv]

Adding to the scandal, the New York Times reported revenue shortfalls, disgruntled staff and an irritated labor union as factors that preceded the firing: [xxxvi]

In a statement, Erica Dodt, president of the Progressive Workers Union, which represents Sierra Club employees, said, “We hope that his departure will open the door for a stronger relationship between workers and management, and allow the Sierra Club to better focus our efforts on fighting the Trump administration and protecting the environment.”^[xxxvii]

Facing a $40 million funding deficit left to him by his predecessors, Jealous had announced layoffs in May 2023, including the Sierra Club’s entire “equity team.” This was the beginning of a dispute between Jealous and PWU that lasted for the rest of his time at Sierra. ^[xxxviii] [xxxix]

In a November 2023 interview Jealous accused the PWU of being “uniquely destructive,” running a “campaign against the Sierra Club for years” and spreading “racist tropes about Black leadership” (Jealous is Black). In June 2024, the PWU announced the first strike authorization in its history, issuing a news release accusing the Sierra Club and Jealous of “union-busting.” Additional layoffs over the following year led to a June 2025 decision by the PWU to file a complaint with the National Labor Relations Board that accused the Sierra Club (i.e.: Jealous) of targeting PWU members in the layoffs.[xl] [xli]

“This is not the first time we have been tested in our 133-year history,” said Blackford in September 2025. “And we will meet this moment by rising together to carry our mission forward with even greater strength and clearer sense of purpose than ever before.” [xlii]

The conservation movement might not have evolved into an anti-energy movement if the Sierra Club had stuck to the sense of purpose they had at their founding.

PDF hyperlink to full report

Endnotes

[i] “Historical Accomplishments.” Sierra Club. Accessed February 6, 2026. https://www.sierraclub.org/accomplishments

[ii] Sierra Club. (EIN: 94-1153307) ProPublica Nonprofit Explorer. Accessed February 10, 2026. https://projects.propublica.org/nonprofits/organizations/941153307

Sierra Club Foundation. (EIN: 94-6069890) ProPublica Nonprofit Explorer. Accessed February 10, 2026. https://projects.propublica.org/nonprofits/organizations/946069890

[iii] Sierra Club. (EIN: 94-1153307) ProPublica Nonprofit Explorer. Accessed February 10, 2026. https://projects.propublica.org/nonprofits/organizations/941153307

Sierra Club Foundation. (EIN: 94-6069890) ProPublica Nonprofit Explorer. Accessed February 10, 2026. https://projects.propublica.org/nonprofits/organizations/946069890

[iv] Most anti-energy NGOs are primarily 501(c)(3) nonprofits and store most of their wealth there. But in 1966 the Sierra Club (then a 501(c)(3) educational NGO) transitioned to an advocacy nonprofit after the IRS accused it of too much lobbying and revoked its tax exemption. See here for more details: Hartmann, Michael E. “IRS revokes Sierra Club’s (c)(3) status in 1966. The Giving Review. April 29, 2025. Accessed February 10, 2026. https://thegivingreview.com/irs-revokes-sierra-clubs-c3-status-in-1966/

[v] “About the Sierra Club.” Sierra Club. Accessed February 6, 2026. https://www.sierraclub.org/about-sierra-club

[vi] “About.” Progressive Workers Union. Accessed February 6, 2026. https://pwunion.org/about/

[vii] Arria, Michael. “The Shift: Sierra Club workers pass historic Palestine resolution.” June 29, 2023. Accessed February 6, 2026. https://mondoweiss.net/2023/06/the-shift-sierra-club-workers-pass-historic-palestine-resolution/

[viii] Schrepfer, Susan R. “Diablo Canyon and the Transformation of the Sierra Club, 1965-1985.” California History. Summer 1992, Volume LXXI, No. 2. Reposted at FoundSF: The San Francisco Digital History Archve. Accessed February 10, 2026. https://www.foundsf.org/Diablo_Canyon_and_the_Transformation_of_the_Sierra_Club,_1965-1985

[ix] Schrepfer, Susan R. “Diablo Canyon and the Transformation of the Sierra Club, 1965-1985.” California History. Summer 1992, Volume LXXI, No. 2. Reposted at FoundSF: The San Francisco Digital History Archve. Accessed February 10, 2026. https://www.foundsf.org/Diablo_Canyon_and_the_Transformation_of_the_Sierra_Club,_1965-1985

[x] Wellock, Thomas Raymond. Critical Masses: Opposition to Nuclear Power in California, 1958-1978. University of Wisconsin Press. 1998. Accessed February 6, 2026.https://www.amazon.com/Critical-Masses-Opposition-Nuclear-California/dp/0299158500

[xi] “Nuclear Free Future.” Sierra Club. Accessed February 10, 2026. https://www.sierraclub.org/nuclear-free

[xii] “Nuclear Free Future.” Sierra Club. Accessed February 10, 2026. https://www.sierraclub.org/nuclear-free

[xiii] Schrepfer, Susan R. “Diablo Canyon and the Transformation of the Sierra Club, 1965-1985.” California History. Summer 1992, Volume LXXI, No. 2. Reposted at FoundSF: The San Francisco Digital History Archve. Accessed February 10, 2026. https://www.foundsf.org/Diablo_Canyon_and_the_Transformation_of_the_Sierra_Club,_1965-1985

[xiv] Schrepfer, Susan R. “Diablo Canyon and the Transformation of the Sierra Club, 1965-1985.” California History. Summer 1992, Volume LXXI, No. 2. Reposted at FoundSF: The San Francisco Digital History Archve. Accessed February 10, 2026. https://www.foundsf.org/Diablo_Canyon_and_the_Transformation_of_the_Sierra_Club,_1965-1985

[xv] Hayward, Steven. “Ansel Adams on Nuclear Power (Updated).” Powerline. September 21, 2013. (Quotes from a Playboy interview of Adams that occurred sometime during the first term of the Reagan administration.) Accessed February 10, 2026. https://www.powerlineblog.com/archives/2013/09/ansel-adams-on-nuclear-power.php

[xvi] “Ansel Adams.” Sierra Club. Accessed February 10, 2026. https://www.sierraclub.org/library/ansel-adams

[xvii] Schrepfer, Susan R. “Diablo Canyon and the Transformation of the Sierra Club, 1965-1985.” California History. Summer 1992, Volume LXXI, No. 2. Reposted at FoundSF: The San Francisco Digital History Archve. Accessed February 10, 2026. https://www.foundsf.org/Diablo_Canyon_and_the_Transformation_of_the_Sierra_Club,_1965-1985

[xviii] Casselman, Ben. “Sierra Club’s Pro-Gas Dilemma.” Wall Street Journal. December 22, 2009. Accessed February 10, 2026. https://www.wsj.com/articles/SB126135534799299475

[xix] Casselman, Ben. “Sierra Club’s Pro-Gas Dilemma.” Wall Street Journal. December 22, 2009. Accessed February 10, 2026. https://www.wsj.com/articles/SB126135534799299475

[xx] Walsh, Bryan. “Exclusive: How the Sierra Club Took Millions From the Natural Gas Industry—and Why They Stopped [UPDATE].” Time. February 2, 2017. Accessed February 10, 2026. https://science.time.com/2012/02/02/exclusive-how-the-sierra-club-took-millions-from-the-natural-gas-industry-and-why-they-stopped/

[xxi] Walsh, Bryan. “Exclusive: How the Sierra Club Took Millions From the Natural Gas Industry—and Why They Stopped [UPDATE].” Time. February 2, 2017. Accessed February 10, 2026. https://science.time.com/2012/02/02/exclusive-how-the-sierra-club-took-millions-from-the-natural-gas-industry-and-why-they-stopped/

[xxii] “Al Gore 2000 On The Issues: Environment.” 4President Corporation. Accessed February 10, 2026 at the Wayback Machine.  https://web.archive.org/web/20101130202026/http://www.4president.org/issues/gore2000/gore2000environment.htm

[xxiii] Walsh, Bryan. “Exclusive: How the Sierra Club Took Millions From the Natural Gas Industry—and Why They Stopped [UPDATE].” Time. February 2, 2017. Accessed February 10, 2026. https://science.time.com/2012/02/02/exclusive-how-the-sierra-club-took-millions-from-the-natural-gas-industry-and-why-they-stopped/

[xxiv] “Beyond Gas.” Sierra Club. Accessed February 10, 2026. https://www.sierraclub.org/wisconsin/beyond-gas

[xxv] “Fossil Fuels.” Sierra Club. Accessed February 10, 2026. https://www.sierraclub.org/issues/climate/fossil-fuels

[xxvi] “Judge Overrules Revolution Wind Stop Work Order, Again.” Sierra Club. January 13, 2026. Accessed February 10, 2026. https://www.sierraclub.org/press-releases/2026/01/judge-overrules-revolution-wind-stop-work-order-again

“Hundreds of Thousands of People Across U.S. Voice Opposition to Trump’s Plan to Expand Offshore Drilling.” Sierra Club. January 27, 2026. Accessed February 10, 2026. https://www.sierraclub.org/press-releases/2026/01/hundreds-thousands-people-across-us-voice-opposition-trump-s-plan-expand

“Renewable Energy.” Sierra Club. Accessed February 10, 2026. https://www.sierraclub.org/issues/climate/renewable-energy

[xxvii] “Sierra Club Celebrates Loren Blackford as its Next Executive Director.” Sierra Club. September 13, 2025. Accessed February 6, 2026. https://www.sierraclub.org/press-releases/2025/09/sierra-club-celebrates-loren-blackford-its-next-executive-director

[xxviii] Colman, Zack. “Sierra Club culture tolerated ‘anger and aggression,’ report finds.” Politico. August 19, 2021. Accessed February 6, 2026. https://www.politico.com/news/2021/08/19/sierra-club-culture-report-506330

[xxix] Colman, Zack. “Sierra Club culture tolerated ‘anger and aggression,’ report finds.” Politico. August 19, 2021. Accessed February 6, 2026. https://www.politico.com/news/2021/08/19/sierra-club-culture-report-506330

[xxx] Colman, Zack. “Sierra Club culture tolerated ‘anger and aggression,’ report finds.” Politico. August 19, 2021. Accessed February 6, 2026. https://www.politico.com/news/2021/08/19/sierra-club-culture-report-506330

[xxxi] “Michael Brune Stepping Down as Sierra Club Executive Director.” Sierra Club. August 12, 2021. Accessed February 10, 2026. https://www.sierraclub.org/press-releases/2021/08/michael-brune-stepping-down-sierra-club-executive-director

[xxxii] “Sierra Club leader Ben Jealous on tackling climate crises.” LA Times Today. March 28, 2023. Accessed February 6, 2026. https://spectrumnews1.com/ca/southern-california/la-times-today/2023/03/28/sierra-club-leader-ben-jealous-on-tacking-climate-crises

Brown, Claire. “Sierra Club’s Board Fires Ben Jealous, the Group’s Executive Director.” New York Times. August 12, 2025. Accessed February 6, 2026. https://web.archive.org/web/20250812185655/www.nytimes.com/2025/08/12/climate/sierra-club-ben-jealous-fired-executive-director.html

PONTEROTTO, JASON. “Ben Jealous fired as Sierra Club’s first Black executive director; many say racism at play.” Amsterdam News (New York). August 14, 2025. Accessed February 6, 2026. https://amsterdamnews.com/news/2025/08/14/ben-jealous-fired-as-sierra-club-first-black-exeutive-director/

[xxxiii] “Sierra Club leader Ben Jealous on tackling climate crises.” LA Times Today. March 28, 2023. Accessed February 6, 2026. https://spectrumnews1.com/ca/southern-california/la-times-today/2023/03/28/sierra-club-leader-ben-jealous-on-tacking-climate-crises

Brown, Claire. “Sierra Club’s Board Fires Ben Jealous, the Group’s Executive Director.” New York Times. August 12, 2025. Accessed February 6, 2026. https://web.archive.org/web/20250812185655/www.nytimes.com/2025/08/12/climate/sierra-club-ben-jealous-fired-executive-director.html

PONTEROTTO, JASON. “Ben Jealous fired as Sierra Club’s first Black executive director; many say racism at play.” Amsterdam News (New York). August 14, 2025. Accessed February 6, 2026. https://amsterdamnews.com/news/2025/08/14/ben-jealous-fired-as-sierra-club-first-black-exeutive-director/

[xxxiv] Bravender, Robin. “Ex-Sierra Club boss was subject of harassment complaint.” E&E News (Politico). September 4, 2025. Accessed February 6, 2026. https://www.eenews.net/articles/ex-sierra-club-boss-was-subject-of-harassment-complaint/

King, Pamela. “Ex-Sierra Club chief of staff sues Ben Jealous for sexual harassment.” E&E News (Politico). April 29, 2026. Accessed May 1, 2026. https://www.eenews.net/articles/ex-sierra-club-chief-of-staff-sues-ben-jealous-for-sexual-harassment/

[xxxv] Bravender, Robin. “Ex-Sierra Club boss was subject of harassment complaint.” E&E News (Politico). September 4, 2025. Accessed February 6, 2026. https://www.eenews.net/articles/ex-sierra-club-boss-was-subject-of-harassment-complaint/

[xxxvi] Brown, Claire. “Sierra Club’s Board Fires Ben Jealous, the Group’s Executive Director.” New York Times. August 12, 2025. Accessed February 6, 2026. https://web.archive.org/web/20250812185655/www.nytimes.com/2025/08/12/climate/sierra-club-ben-jealous-fired-executive-director.html

[xxxvii] Brown, Claire. “Sierra Club’s Board Fires Ben Jealous, the Group’s Executive Director.” New York Times. August 12, 2025. Accessed February 6, 2026. https://web.archive.org/web/20250812185655/www.nytimes.com/2025/08/12/climate/sierra-club-ben-jealous-fired-executive-director.html

[xxxviii] Bravender, Robin. “Sierra Club’s boss is at war with his staff. He blames them.” E&E News (Politico). November 9, 2023. Accessed February 6, 2026. https://www.eenews.net/articles/sierra-clubs-boss-is-at-war-with-his-staff-he-blames-them/

[xxxix] “Sierra Club Union Authorizes First-Ever Strike to Counter Union-Busting.” Progressive Workers Union. June 27, 2024. Accessed February 6, 2026. https://pwunion.org/sierra-club-union-authorizes-first-ever-strike-to-counter-union-busting/

[xl] Bravender, Robin. “Sierra Club’s boss is at war with his staff. He blames them.” E&E News (Politico). November 9, 2023. Accessed February 6, 2026. https://www.eenews.net/articles/sierra-clubs-boss-is-at-war-with-his-staff-he-blames-them/

[xli] Bravender, Robin. “Sierra Club union says layoffs broke the law.” Politico PRO. June 24, 2025. Accessed February 6, 2026. https://subscriber.politicopro.com/article/eenews/2025/06/24/sierra-club-union-says-layoffs-broke-the-law-00420824

[xlii] “Sierra Club Celebrates Loren Blackford as its Next Executive Director.” Sierra Club. September 13, 2025. Accessed February 6, 2026. https://www.sierraclub.org/press-releases/2025/09/sierra-club-celebrates-loren-blackford-its-next-executive-director

Source: https://capitalresearch.org/article/enemies-of-energy-sierra-club/