The Brief

More than 13,000 years ago, when an abundance of saber-toothed cats roamed the Los Angeles Basin, the giant mammal would hide in tall savanna grasses or behind juniper shrubs and stalk its prey.

“We think they were probably ambush predators,” says Emily Lindsey, associate curator and excavation site director at the La Brea Tar Pits museum and paleontology research site.

When it spotted its target — horses, camels, mammoths or other large animals known as megafauna — it would use its powerful forearms to leap out and pin down its prey.

Then, using its 8-inch-long curved canines — serrated like a steak knife — it would slice through a vein and let the animal bleed out.

“All of that information is based on research here because we have this incredible collection of more than 2,000 saber-toothed cats,” Lindsey says. “It’s really rare that we have the whole record. You don't usually get that in paleontology.”

L.A.'s climate past and future

The La Brea Tar Pits — home to more than 3.5 million Ice Age fossils — is one of the planet’s best-kept records of what it was like in the area we now know as Southern California over the last 60,000 years. It’s also the world’s only active urban fossil dig site.

Fossils found in the asphalt help paint the picture of the life that once flourished here during the Ice Age: saber-tooth cats, giant sloths, dire wolves, grizzly bears, bison as well as juniper and oak trees.

Emily Lindsey, an assistant curator at the LA Brea Tar Pits, places a fossil inside the fossil collection room.

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But it's not just telling the story of the region’s past. This collection of Ice Age fossils also helps scientists understand what led to the most massive extinction of megaspecies on Earth since dinosaurs, when droves of large mammals suddenly died as extreme heat, drought and large-scale wildfires overwhelmed the region.

And as we endure another period of significant environmental change, these fossils also offer a window into the future.

“There was this ‘ah ha’ moment for paleontologists,” Lindsey says. “We said: ‘Oh wait, we have a really unique insight on that story because we can actually look at these different windows of different habitats from different times and see how they respond to climate change in real time.”

It’s part of a growing field called paleoecology, which aims to use the knowledge of prehistoric ecosystems that fossils yield to predict how plants and animals will respond to environmental events now and in the future.

“The fact that we have particular species of plants, or insects, or birds, or rodents can tell us a lot about how hot or cold it was, how wet or dry it was, and how that environment changed through time,” Lindsey says.

This link between the end of the Ice Age and the global warming we’re experiencing now is a focus of the ongoing research at the Tar Pits. Particularly, scientists seek to use fossil data to make decisions about how to preserve biodiversity today.

“You can only get that by looking at the fossil record,” Lindsey says.

The tar pits

About 1,000 feet beneath the metropolis of L.A. sits the Salt Lake Oil Field.
(The Los Angeles Basin is the richest in terms of oil by unit volume on earth). That, paired with the abundance of earthquakes in the region, which create cracks and chasms in the earth, paves the way for the tar pits.

Tar pits — sticky, shallow pools of asphalt that seep up through cracks and fissures in the ground — are essentially naturally occurring preservation deposits. The asphalt is so sticky that when animals stepped into it — even enormous ones like the now extinct pre-Columbian mammoth — they got trapped and couldn't get out.

Inside Tar Pit 91, where research is currently being done.

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The result? Meticulously preserved fossils that have been embalmed in asphalt for tens of thousands of years without exposure to air.

“So we get phenomenal preservation not just of bones, but of leaves and wood, insects and shells,” Lindsey says. “That’s what’s allowed us to build up the richest record of Ice Age life anywhere.”

Researchers examine fossils discovered in the tar pits.

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Using the fossil record to inform conservation decisions

Studies from Tar Pits researchers suggest extreme heat, drought and large-scale wildfires might be at the root of the last major extinction event.

Last year, a study published by researchers there found that large-scale wildfires — possibly started by humans — wiped out many of the large Ice Age mammals. The research broke new ground in an ongoing scientific debate over what triggered the Earth’s last major extinction event.

It adds more evidence to the growing understanding that extreme heat, drought and wildfires can drastically change habitats, leading to species extinction.

“This is just one example of how we can use fossil data to inform conservation and land management decisions today,” Lindsey says.

In an ongoing partnership with the Nature Conservancy, La Brea Tar Pits is now developing a practitioner's guide for land managers, mapping out ways to use fossil data in environmental decision making.

“In other words: How do you use historical and paleontological data to help inform conservation and restoration work in urban areas?” Lindsey says. “This will help address that.”

"When planning for these types of projects, The Nature Conservancy sets goals using information from a variety of sources," says Sophie Parker, director of science for climate and land use at The Nature Conservancy. "Knowing what was present at a site at multiple timepoints in the past, including the more distant past, is useful because it gives us a broader perspective on how to craft our goals."

Asphalt can be observed flowing from the gated tar pits, allowing visitors to witness the phenomenon.

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The Tar Pits also dedicates a small section of the park as the “Pleistocene Garden,” which contains plants that grew at La Brea at different times in history found in the fossil record. With plans for a major re-landscaping of the park currently in the works, there is a focus to significantly expand plants in line with the paleontological science on the grounds.

“It’s a way to viscerally communicate that story but also bring back some of those plants and serve as seed banks and help support urban nature,” Lindsey says.

Sharing the climate story

Beyond the rich scientific research backed by tens of thousands of years of fossil data, Lindsey says the most important part of the work they do at this critical environmental moment is public education.

By presenting current climate research alongside Ice Age fossil data, the hope is that it will drive a deeper understanding of our environmental crisis and emphasize a dire conclusion: then, as now, climate changes and human activities can intersect to drive large scale extinctions.

It's all laid out for the public to see in the La Brea Tar Pits museum and across its grounds.

“To have a place in the third biggest city in North America where people can see an entire scientific process," says Lindsey, "that’s another very powerful thing.”

Remains of mammoths can be seen at the La Brea Tar Pits.

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There is one notable, but perhaps hopeful, difference between then and now, Lindsey says.

The climate change that occurred at the end of the Ice Age 13,000 years ago was purely related to the earth’s orbital cycles.

Today, it’s 100% us.

“Meaning we completely have the ability to stop it if we want to,” Lindsey says. “It’s just a matter of political and societal will. I hope this helps people understand that small human actions could push the ecosystem to a tipping point.”

Biking on river trails, going on picnics and surfing in the ocean are activities California residents cherish every summer. But headlines about the use of toxic chemicals in flood control channels around Orange County have created anxiety for those looking forward to their favorite activities this summer.

Dozens of environmental activists and Orange County residents packed the Orange County Board of Supervisors meeting this week to urge the county to halt the routine use of toxins they say poison waterways and wash out into the ocean.

But several supervisors said it wasn’t that simple. The chemical prevents overgrowth in flood control channels, and that overgrowth could lead to backups and flooding, affecting neighborhoods and businesses during heavy rains.

Controversy over the chemical use led to an announcement last month by Orange County Supervisor Katrina Foley, declaring that chemical usage would be halted for the moment. The issue then came before the board this week for further discussion.

Supervisors decided to study the issue and revisit it in the months ahead, and directed the OC Public Works department to evaluate methods for clearing overgrowth of vegetation that crowd flood channels, and look for alternate methods of doing so.

Brent Linas, founder of the Orange County Creek Team, which has succeeded in bringing the environmental issue to the public’s attention through salty Instagram posts and other social media tactics, blasted what he described as the board’s inaction.

He feels that the board is “deeply dysfunctional” and plans on using the meeting as momentum to spread awareness about the chemicals' negative effects on the environment. “There’s palpable outrage in Orange County right now around this and we fully intend to tap into that,” Linas said.

Foley also plans to reintroduce public noticing requirements at the next meeting June 23. The notices would alert residents to the planned use of any pesticides and herbicides. “Orange County residents deserve transparency to help make informed decisions about where their families recreate,” Foley said in a statement released the after the meeting. “I remain encouraged by the overwhelming public support in exploring nontoxic solutions for our waterways.”

How to watchdog your local government

One of the best things you can do to hold officials accountable is pay attention. Your city council, board of supervisors, school board and more all hold public meetings that anybody can attend. These are times you can talk to your elected officials directly and hear about the policies they’re voting on that affect your community.

• Read tips on how to get involved.
• The Orange County Board of Supervisors meets on alternating Tuesdays at 9:30 a.m. at 400 W. Civic Center Drive, Santa Ana. You can check out the O.C. Board of Supervisors full calendar here.
• Learn how to submit a public comment to the O.C. Board of Supervisors.

A program dedicated to providing low-income California residents with extra money for fruits and vegetables is likely to go under this summer if additional funds are not allocated in this year’s state budget, according to concerned food justice advocates.

The CalFresh Fruit and Vegetable EBT Program provides CalFresh recipients with up to $60 a month of free produce each month, in addition to their benefits. In May alone, the program disbursed over $5 million and “served 95,520 California households,” said Grecia Marquez-Nieblas, senior manager at food policy nonprofit Fullwell, which has backed the program.

“Overwhelmingly, folks have been telling us that they want it to continue, that it’s made a really positive impact on them,” Marquez-Nieblas said. “Their diabetes is better managed; their high blood pressure is better managed.”

Those people are now at risk of losing access to that support as funds whittle down. The state budget is set to be finalized on June 15, and “as far as we know, there is no continued funding that has been proposed,” Marquez-Nieblas said.

“When this program ends, we’ll have less money to spend, [at] a time when groceries are incredibly more expensive. Gas is more expensive. Everything is more expensive,” she said. “It’s just, unfortunately, a compounding effect. There’s lots of stuff that’s impacting the same people.”

The program is simple to use: When customers purchase food at participating markets, like Arteaga’s Food Center in San José, they just swipe their EBT (electronic benefit transfer) card.

For every purchase of fresh fruits and vegetables with that card, customers receive an instant rebate each month, applied to their card. The rebate money can be spent on any food or goods covered by CalFresh, like meat, eggs and dairy — it is not limited to fruits and vegetables.

Marquez-Nieblas explained that the pilot program has been implemented in three phases — the latest of which received a limited, one-time allocation of $36 million from the state budget. That seems like a large number, “until we realize that there are hundreds of thousands of individuals across the state using the program.”

“It’s been proven many times that CalFresh — and programs like this that support people having more money for food — are incredibly impactful for lifting children out of poverty, for supporting seniors with limited incomes, for anybody,” Marquez-Nieblas said. “Foundationally, these programs are good. They’re good for public health.”

Food policy advocates said they are hoping for $100 million for the program to continue to operate year-round. Instead, it was reappropriated around $4.8 million — the remaining funds from last year’s budget cycle, in Gov. Gavin Newsom’s “May Revise” proposal, according to H.D. Palmer, spokesperson for the California Department of Finance.

“The program will operate until funds are fully utilized,” Palmer said in an email to KQED.

The program’s end would come at a particularly stressful time for CalFresh recipients. This month, for the first time since the COVID-19 pandemic began, California has begun enforcing new and expanded federal guidelines that require some CalFresh recipients to work 20 hours a week, or an average of 80 hours a month — with a stark reduction in food benefits for those who don’t.

The changes were prompted by the passing of President Donald Trump’s H.R.1 last year.

“Not only does it add in the onerous work requirement — a lot of people who are already receiving CalFresh are working — but now they have this bureaucratic paperwork to provide,” said Kathy Saile, California director of national nonprofit No Kid Hungry. “There’s some real concern that people could lose benefits just because they couldn’t figure out the paperwork.”

H.R. 1’s impact, which also cuts food benefits for some refugees and asylum seekers, is apparent, according to federal data analyzed by the nonpartisan research group Center on Budget and Policy Priorities.

The center estimated that nationwide, SNAP participation fell by almost 9% — more than 3.5 million people — between H.R.1’s start in July 2025 and February 2026.

Palmer said the state was taking proactive steps to maintain residents’ enrollment in the program.

“This includes leveraging existing data to determine possible exemptions from the new SNAP work requirements, implementing automation, and conducting client outreach,” he said.

He added that the latest budget revision has “a total of $38 million for the CalFood program — which funds food banks for the purchase, storage, and transportation of food grown and/or produced in California.”

In a time of rising bureaucratic barriers implemented by H.R. 1, Marquez-Nieblas said the CalFresh Fruit and Vegetable EBT Program is part of the state’s food safety net.

“This is not just about backfill,” she said. “It’s not just about responding to the impacts (of H.R. 1), which are incredibly awful. It’s also about setting ourselves up for success in the future, knowing we have to invest proactively.”

Marquez-Nieblas said CalFresh recipients should keep their eyes on the California Department of Social Services website for any possible updates and changes in the future.

While implementation of California’s high school ethnic studies mandate has stalled, districts across the state are rolling out classes that encourage students to explore the lesser-told histories of their communities.

Freshmen at Duarte High School this year unearthed the history of a San Gabriel Valley community that was all but erased by commercial development and the construction of the 210 and 605 freeways.

Newspaper headlines often focused on incidents of violence and segregation in the majority Black and Mexican American community of Rocktown, but when the students interviewed former residents, they heard a different story.

“It was a great community for us,” said Alfred Hernandez Zamora. “We just don't want to be forgotten.”

The study of Rocktown was a central theme in the school's first ethnic studies course.

“Ethnic studies is providing space to hear from communities and from points of view that are not traditionally covered in our history classes,” said Casey Ramirez, who teaches the class at Duarte High in addition to government, economics, world and U.S. history.

California legislators passed a law in 2021 that required all schools to offer the course by the 2025-26 school year, but have yet to provide the funding needed to enact the mandate. Duarte Unified, like many other districts, passed its own one-semester ethnic studies graduation requirement ahead of the expected state deadline.

Duarte High School’s curriculum is the result of a collaboration between educators, research into the region’s history and the students’ own interests.

“I've only seen one part of Duarte, and that's the Duarte that I was raised in,” said Leslie Martinez, a rising sophomore. “There's a lot of things that Ms. Ramirez is teaching me, and that's making me more curious to dig deeper [into] my city and where I grew up.”

An opportunity to create an ‘engaging class’

California’s model ethnic studies curriculum describes the field as an “interdisciplinary study of race, ethnicity, and Indigeneity, with an emphasis on the experiences of people of color in the United States.” Districts could develop their course based on this framework or from scratch.

“It was our opportunity to create a really engaging class that really speaks to our student body,” said Luis Haro, Duarte High’s principal for the last eight years.

The majority of Duarte High School’s population is Latino, but there are also Filipino, Asian, white, Black and multiracial students. Most students qualify for free-and reduced price lunches, a proxy for being low-income in public schools.

“In my experience, our students don't know our history, and they don't really have a true understanding of their own identity,” Haro said.

Haro joined a committee of administrators and teachers, including Ramirez, that collaborated with the UCLA History-Geography Project to develop the new course.

UCLA staff guided Duarte educators through reams of local history research and helped the team develop goals for the class, including a student-led civics project.

“Getting to learn and feel like a college student again,” Ramirez said. “It really did make me excited to teach the class.”

They also developed units on students’ personal identity, Indigenous, Latino, Black and Asian American Pacific Islander history. The committee also met with parents and presented their work to the district’s board.

“[Ethnic studies] gave us a path to this project to see people in our community that aren't really talked about,” Ramirez said.

Uncovering the history of the ‘Davis Addition’

The region is the original home of the Gabrielino/Tongva Nation. The then-governor of Alta California granted former soldier Andres Avelino Duarte nearly 7,000 acres in 1841, including what became the city that shared his name. The area was eventually subdivided into farms and eventually, homes.

From the late 19th century through the 1970s, Black and Mexican American families settled in the “Davis Addition,” a subdivision of the land grant that became better known as Rocktown.

Ramirez first read about Rocktown in the research UCLA gathered for the curriculum development process, but couldn’t find much else about the community online.

She started downloading news articles from Newspapers.com and sharing them with the class. Many of the stories often focused on crime and violence in the community, from police raids on drinking and gambling establishments, to fires.

The articles also alluded to the segregation of the early 20th century.

A 1928 article from the Monrovia Daily News described the schedule for a new municipal pool. Mondays were “reserved for the use of colored people.”

“ Why are we not allowing people to do things simply because of the color of their skin or like their origin?” said Khloe Carter, a rising sophomore who took the ethnic studies class.

Carter said it felt important to her, as a person of color, to learn about people’s experiences with discrimination in the past.

“I'd say that has made me smarter and more aware of other people's struggles and what other people have to deal with and other people's cultures and other people's traditions,” Carter said.

The first wave of Rocktown displacement preceded the construction of the 210 and 605 freeways in the 1960s. The last several dozen families were moved to make way for a business complex in the 1970s. Stories referred to the area as blighted and “depressed.”

“ We took it as our job to dig further, deeper, to find out if it was true or not,” Martinez said.

With Ramirez’s help — and several volunteers from the Facebook group Rocktown Oldies Club — the students started to schedule interviews with former residents. The school’s film class volunteered to record the conversations.

The students heard stories about everyday life that were absent from the news coverage of time — Sunday barbecues, roller skating, fishing, picnicking and swimming near the Santa Fe Dam.

Zamora, who was born in Rocktown in 1949, offered a first-person history that isn’t available elsewhere — down to the community’s name: “ You could not even dig a, a foot into the ground without running into rocks,” he said. “ You could throw water on the ground and a rock would grow, you know?”

Many of the residents raised goats, pigs, pigeons and chickens in their backyards. Zamora said a routine car repair could quickly become a community gathering with neighbors joining in to help.

“That made it … so great to live there, 'cause everybody was like family,” Zamora said. “Even people that weren't related to you, it was really close friendships there.”

A typical gathering of Alfred Hernandez Zamora's family in an undated photo from their Rocktown days. Everyone gathered for Sunday dinners at his grandmother's house.

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Courtesy Alfred Hernandez Zamora

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Zamora's relatives Rayno Hernandez and Christina Hernandez Padilla as kids riding their bikes through Rocktown.

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Courtesy Alfred Hernandez Zamora

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Zamora said Rocktown offered a reprieve from the discrimination against Black and Latino residents in other parts of the San Gabriel Valley at the time.

“We played ball together. We swam together. We ate together,” Zamora said. “Even though there was different cultures there, we still were able to get along with everybody.”

These interviews gave the students new perspectives to consider.

“ People make a lot of stereotypes and a lot of guesses … like, ‘Oh, this community can be so ghetto,’" Martinez said. “But honestly, like I think if you haven't been in the community, you can't really say anything.”

Remembering Rocktown

The Duarte Historical Museum hosted a pop-up exhibition of the students’ capstone project.

“I was very impressed with the job that they did, being able to get all this history and the information and the interviews with people,” said Liz Reilly, president of the Duarte Historical Society and Museum and former mayor. "I thought that was really fabulous.”

Reilly, who moved to Duarte in 1987, had heard of Rocktown, but knew little about the neighborhood.

Izzy Guzman, another student who took ethnic studies at Duarte High, said the account she heard from the three women she interviewed differed from these Rocktown headlines.   "They've all seemed really nice and really genuine," Guzman said. "I just feel like people should understand, even if they don't know what Rocktown is, they should understand that, it was just a basic community, and that they should be treated with the same respect as everyone else."

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The exhibition included a map of Rocktown (still the subject of some debate) and dozens of historical photos, often provided by the people they interviewed.

“ I found it so amazing how much people showed up for our project and how much the community of Rocktown has shown up for our project,” Carter said.

Former residents, including Zamora, were among the dozens of people who attended the exhibition’s grand opening in mid-May.

“For them to recognize places that were forgotten, that meant a lot,” Zamora said. “ Nobody seems to remember it. I mean, except the people that lived there.”

Ethnic studies faces growing challenges

While the school’s principal, students and former Rocktown residents have embraced the ethnic studies class, Ramirez said she’s also heard criticism.

During Duarte High’s open house, Ramirez said a parent voiced her disagreement with the class and threatened to file a grievance even though her child had yet to enroll at the school.

“ I'm a parent, so I understand, especially if it's something that you're not familiar with and your kids are learning something different from what you learned, it can be scary,” Ramirez said. “My approach is never to impose my viewpoints. It's to provide alternative perspectives.”

Some lawmakers have also criticized school offerings that intersect with race and ethnicity.

In the last five years, 20 states have banned or restricted teaching critical race theory, an academic concept that race is a social construct and that racism is embedded in specific societal structures.

Teacher Casey Ramirez said teaching students to view history from multiple points of view and form their own opinions is a key feature of the ethnic studies class.

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Courtesy Oscar Ramirez

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California school districts from Los Alamitos to San Francisco have faced pushback over their ethnic studies curriculum despite passage of the state mandate.

State lawmakers’ decision to withhold money for teacher training and materials has delayed the ethnic studies graduation requirement.

Daniel Diaz, director of the UCLA History-Geography Project, said there was a flood of interest when the ethnic studies mandate was first passed, but now fewer districts are paying for related professional development.

“Which in turn then impacts what happens to our project and … who we're able to support in terms of staffing,” Diaz said.

In June, UCLA laid off one of the educators instrumental in helping Duarte develop its ethnic studies curriculum.

In a statement, John McDonald, director of media relations at the UCLA School of Education and Information Studies, said the History-Geography Project has laid off four staff members total after funded projects ended in the last year.

“UCLA Center X is committed to the work and actively seeking new funding for similar efforts,” McDonald said.

What that means for other districts looking for assistance with ethnic studies programs remains to be seen.

Ramirez said her UCLA collaborator was “phenomenal” and continued to support the project even after the contract with the district formally ended.

“ I don't think that this year and this project would've been what it was without having that support,” Ramirez said.

A business center now stands south of the 210 and west of the 605 where part of Rocktown once was. Some of the street names, including Evergreen and Flower, remain the same.

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The Rocktown Project’s future

Duarte High School will continue the ethnic studies class.

More former residents have already contacted Ramirez hoping to be interviewed by next year’s students. She also plans to publish the students’ work on a website and a future goal is to memorialize Rocktown with a physical marker in Duarte.

“You need to know whose land you're on and who was there,” said Sylvia Gonzales Youngblood, who was born in Duarte in 1967 and grew up visiting the home her maternal grandfather built in Rocktown.

She said when she was a student there wasn’t an opportunity to learn about her family’s  Ohlone Mission Indian and Mexican heritage and she was discouraged from speaking Spanish.

“Now as I'm older, I realize just how much history and of ourselves we lose,” Youngblood said.

Carter, the rising sophomore, said after taking ethnic studies, she feels more connected to the city she moved to about a year ago.

“It's important that we know this side of history so a community like Rocktown doesn't get lost again,” Carter said. “Every voice should be heard, including Rocktown's.”