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California Schools Are Losing Tree Canopy

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California Schools Are Losing Tree Canopy


About 85% of elementary schools studied in California experienced some loss of trees between 2018 and 2022, according to a paper from the University of California, Davis, published this month in the journal Urban Forestry and Urban Greening.

Members of the UC Davis Urban Science Lab found that while the average decline was less than 2%, some districts in the Central Valley — including schools with few trees to lose — lost up to a quarter of their tree cover. The most severe losses were concentrated in Tulare County, while the most notable gains were found in Imperial County.

This map, figure 2B from the study, illustrates the net change in tree canopy cover at urban school districts between 2018 and 2022. Canopy losses tended to cluster in the Central Valley and parts of Southern California. (UC Davis)

The findings are troubling as climate change will likely intensify extreme heat and drought conditions. The study underscores an urgent need to improve tree canopy in low-shade, high-need schools and to protect existing tree cover in areas facing loss. 

“We are trying to measure to what extent we are exposing kids to temperatures that might be stressing their body to a level that becomes uncomfortable or dangerous,” said Alessandro Ossola, an associate professor of plant sciences who directs the Urban Science Lab at UC Davis. 

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The team continued the research this past summer at elementary schools across the state, measuring tree canopies and maximum temperatures at playgrounds, basketball courts, soccer fields and other outdoor spaces.

UC Davis researchers discovered California school playgrounds are hitting a scorching 120°F heat index. Watch as they use high-tech sensors and a roving cart named MaRTyna to measure extreme heat across elementary schools. (Jael Mackendorf/UC Davis)

Tree canopies cover only about 4% to 6% of the average California school campus. That means the roughly 5.8 million K-12 public school students in California often take breaks and participate in outdoor activities under the glaring sun. 

As part of the work, researchers mapped tree cover and heat over the course of a hot day at schools in inland and coastal areas of Northern and Southern California.

UC Davis student Tyler Reece Wakabayashi works with MaRTyna, a roving cart that measures information related to mean radiant temperature and other data points. (Jael Mackendorf /UC Davis) 

The research is a joint effort with UC Davis, UC Berkeley and UCLA and is funded by the U.S. Forest Service and supported by the nonprofit Green Schoolyards America through its California Schoolyard Tree Canopy study. 

“Most schools are actually a nature desert, which is antithetical because we know that early life exposure of humans to nature is critical for them to develop skills, improve their microbiome, become more environmentally active and so on,” Ossola said. “Trees are a hidden asset and an underutilized asset.”

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This news release is adapted from a longer article from the UC Davis College of Agricultural and Environmental Sciences. Read their full feature story, “Researchers Measure Schoolyard Heat One Step at a Time.”



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California just handed oil companies billions in free pollution permits

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California just handed oil companies billions in free pollution permits


By Alejandro Lazo, CalMatters

This story was originally published by CalMatters. Sign up for their newsletters.

California air regulators on Friday approved a contentious overhaul of the state’s carbon market, creating a program that could steer billions of dollars in free pollution permits to oil refineries and other major polluters over the objections of environmental groups, key lawmakers and three of the board’s own members.

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Ten members of the California Air Resources Board voted to adopt the changes to its cap-and-invest program after two days of lengthy hearings, including a full day dedicated to hundreds of public comments.

The overhaul followed intensive lobbying by the oil industry as well as pressure from Gov. Gavin Newsom’s administration to help keep refineries operating in the state amid rising gas prices.

The approval sets up a potential budget fight in Sacramento. The Legislative Analyst’s Office projects that quarterly auction revenue for state climate programs will drop from roughly $4 billion a year to about $2 billion under the new overhaul.

Such a shortfall would effectively zero out programs lawmakers spent last year fighting to fund: affordable housing, public transit, drinking water in low-income communities and pollution monitoring in California’s most polluted neighborhoods.

The governor’s office praised the measure as a compromise that balanced economic uncertainty with the state’s climate goals. Refinery closures and the Iran-Israel war have driven average California gas prices above $6 a gallon. 

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Newsom, in a statement, used the moment to draw a contrast with President Donald Trump.

“While Trump sows ongoing chaos and uncertainty, California is staying focused by protecting our economy, safeguarding public health, and doubling down on the clean energy future all Californians deserve,” he said. 

Environmentalists warned the changes to the program amount to a giveaway to the fossil fuel industry that weakens California’s only program setting a firm cap on greenhouse gas emissions.

Katelyn Roedner Sutter, California senior director for the Environmental Defense Fund, called the decision “deeply misguided” for prioritizing polluters over communities.

“Newsom’s air regulators are handing billions to oil executives at the expense of our climate, health, and affordability for working families in a rushed process that has shortchanged meaningful public participation,” said Bahram Fazeli, policy director at Communities for a Better Environment. 

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How the program works — and what changes

California’s 13-year-old carbon market forces major polluters to buy permits while the state lowers the overall cap each year. Friday’s vote will reduce those permits – and creates a new subsidy program carved out of the market.

The program, which may still see changes, could make available a new pool of free pollution permits available to industry valued at as much as $4 billion. Companies that pledge to invest in clean energy and efficiency may qualify for the permits in exchange for investments in clean energy. 

The pool will be capped at 118.3 million permits — the same number the air board has said must come off the market for California to hit its 2030 climate target. Environmentalists say the proposal risks wiping out those reductions. 

Half are reserved for the fossil fuel sector. A recent Berkeley analysis, by the chair of an independent committee that oversees the carbon market, found refineries could end up with more free permits than they need to cover their emissions.

The air board has defended the design. Officials say the credits will go only to companies undertaking decarbonization projects, will be limited and temporary and can be clawed back if companies misuse them. The plan, they say, is meant to keep California refineries operating at a time of mounting closures and global market pressure. According to air regulators, the amended program will spur clean-energy investment as Trump cuts federal support.

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This article was originally published on CalMatters and was republished under the Creative Commons Attribution-NonCommercial-NoDerivatives license.



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Man charged with murder, kidnapping their 5-year-old child before fleeing to Mexico

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Man charged with murder, kidnapping their 5-year-old child before fleeing to Mexico


A 40-year-old Los Angeles man was charged with murder after allegedly killing his girlfriend and kidnapping their young child before fleeing to Mexico, according to authorities.

Ruben Fregosojuarez has been charged one count of murder and one misdemeanor count of child abuse under circumstance or conditions other than great bodily injury or death, according to a Los Angeles County District Attorney’s Office news release. Authorities first identified him as Ruben Fregoso but Los Angeles County prosecutors listed him as Ruben Fregosojuarez.

On Monday around 12:39 p.m., the Los Angeles Police Department conducted a welfare check in the 2600 block of South Alsace Avenue in West Adams, police said in a news release.

Officers found a woman dead inside the home “as a result of violence” and the woman’s daughter missing, police said. On Monday night, the California Highway Patrol issued an Amber Alert for the child, Daleza.

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Photos obtained by NBC4 appear to show Fregosojuarez in a parking garage in San Ysidro with the girl on Sunday. The California Highway Patrol has listed her age as 4 years old but Los Angeles police say the girl is 5. She is also described as the suspect’s daughter.

The alert said that the girl was last seen with Fregosojuarez, who allegedly abducted her in a 2019 Land Rover Discovery, on Sunday at about 4 a.m.

The CHP posted in an update that the vehicle was found but that the child and man were still missing. The girl is described as 3 feet tall, 45 pounds, and having black hair and brown eyes.



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23andMe Sued by California Over Massive 2023 Data Breach

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23andMe Sued by California Over Massive 2023 Data Breach


California’s attorney general is suing the consumer genetics testing company formerly known as 23andMe, alleging the company failed to protect customers’ sensitive personal information in a massive 2023 data breach that exposed the ancestry and genetic data of nearly 7 million people.

Attorney General Rob Bonta filed the lawsuit on Thursday in San Francisco Superior Court against Chrome Holding Co., formerly known as 23andMe, accusing the company of failing to properly investigate or respond to numerous warnings that its systems had been compromised. The company’s mail-in self-testing kits became synonymous with DNA testing before it filed for bankruptcy in 2025.

In 2023, cybercriminals breached 23andMe’s systems by using a “credential-stuffing attack,” which involves bombarding online accounts with huge sets of user names and passwords stolen in previous unrelated attacks. Over a period of months, the intruders were able to make off with the personal data of more than 6.9 million people.

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“23andMe’s security measures were so lax that the threat actor was able to operate undetected within 23andMe’s systems for over five months, and remarkably, 23andMe only began investigating after the threat actor offered the stolen user data for sale on the dark web and reached out to 23andMe to demand a ransom,” Bonta’s office said in the complaint. 

The San Francisco-based company, which allowed people to submit genetic materials and get a snapshot of their ancestry, revealed in October 2023 that hackers had accessed customer information in the prolonged data breach that targeted customers with Chinese or Ashkenazi Jewish ancestry. The stolen data of more than 1 million Asian-Pacific Islander and Ashkenazi Jewish users was later posted for sale on the dark web. 

“The sale of this data on the dark web took place amidst a period of mounting anti-Asian American and Pacific Islander and antisemitic hate and violence,” Bonta said in a press release. “This is disturbing and incredibly dangerous.”

 A January 2024 lawsuit accused the company of not doing enough to protect its customers and not notifying certain customers that their data had been targeted specifically. It later settled the lawsuit for $30 million.

23andMe representatives didn’t immediately respond to a request for comment.

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At its peak, 23andMe became the best-known name in the emerging area of DNA self-testing, with users paying upwards of $99 for kits that gave them insights into their genetic makeup, potential relatives and ancestry. But the company’s momentum slowed down in recent years after its $3.5 billion public offering in 2021.

Last July, TTAM Research Institute, a nonprofit led by Anne Wojcicki, 23andMe’s cofounder and former CEO, acquired 23andMe’s assets for $305 million.    





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