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The Brief

The most important stories for you to know today
  • from UCLA and USC largely avoid charges
    California Highway Patrol officers clear a pro-Palestinian encampment with a police helicopter above, as a a Palestinian flag waves.
    California Highway Patrol officers clear a pro-Palestinian encampment with a police helicopter above, as a a Palestinian flag waves.

    Topline:

    The L.A. City Attorney’s office said Friday that of the hundreds of arrests made at last year's Gaza war protests on the campuses of UCLA and USC, two people are facing misdemeanor criminal charges. Three others are being referred to “City Attorney Hearings”, an alternative procedure that avoids criminal prosecution.

    Why it matters: Prosecutions stemming from college protests against the Israel-Hamas war have been a hot button issue following the encampment movement that erupted across the country last year.

    The backstory: Through April and May last year, protesters supporting Palestine setup encampments on USC and UCLA to oppose the Gaza conflict. The University of California Police Department and LAPD made arrests at both campuses, over 300 of those were referred to the City Attorney’s Office.

    On Friday, City Attorney Hydee Feldstein Soto released a statement saying that due to “insufficient evidence,” her office won’t file charges against most arrestees.

    What's next: Two of those arrested at UCLA face misdemeanor criminal charges, both for alleged conduct at UCLA. Matthew Katz is charged with assault, false imprisonment and resisting arrest. Edan On is charged with assault and brandishing a weapon.

    Go deeper: Pro-Palestinian Demonstrators At USC Join Camp-In Movement On Heels Of Valedictorian Controversy

    Topline:

    The L.A. city attorney’s office said Friday that of the hundreds of arrests made at last year's Gaza war protests on the campuses of UCLA and USC, two people are facing misdemeanor criminal charges. Three others are being referred to “city attorney hearings,” an alternative procedure that avoids criminal prosecution.

    Why it matters: Prosecutions stemming from college protests against the Israel-Hamas war have been a hot button issue following the encampment movement that erupted across the country last year.

    The backstory: Through April and May last year, protesters supporting Palestinians set up encampments on USC and UCLA to oppose the Gaza conflict. The University of California Police Department and LAPD made arrests at both campuses. More than 300 of those were referred to the city attorney. On Friday, City Attorney Hydee Feldstein Soto released a statement saying that due to “insufficient evidence,” her office won’t file charges against most arrestees.

    What's next: Two of those arrested at UCLA face misdemeanor criminal charges, both for alleged conduct at UCLA. Matthew Katz is charged with assault, false imprisonment and resisting arrest. Edan On is charged with assault and brandishing a weapon.

    Go deeper: Pro-Palestinian Demonstrators At USC Join Camp-In Movement On Heels Of Valedictorian Controversy

  • High surf at beaches could be life threatening
    A satellite image shows a series of storms off the coast of California.
    A satellite image shows a series of storms off the coast of California on Sept. 4, 2026.

    Topline:

    Light rain is expected across Southern California over the holiday weekend and forecasters are warning of dangerous swimming conditions at the beach.

    Beach hazards: There’s a high risk of potentially life-threatening rip currents and large waves over the weekend along the coast. Waves could reach 10 feet in places. Beachgoers should swim near lifeguards and stay off of rocks and jetties. There could also be some coastal flooding. The National Weather Service has issued coastal flood and high surf advisories beginning Saturday morning that will remain in effect through next week.

    Rain forecast: Most of the rain is expected to come on Sunday. It will likely remain light, with less than half an inch falling in most places. The rain will also come with a low chance of thunderstorms. Cloud cover could also stick around this weekend, with or without rain. Temperatures are supposed to remain relatively mild, but because of the clouds, they won’t drop down as much at night.

    How we got here: The moisture and surf is being driven to Southern California by Hurricane Marie hundreds of miles away in the Pacific Ocean. Marie is the latest in a sequence of tropical storms that have formed off the coast of Mexico and moved northeast. Forecasters say this summer’s Pacific hurricane season has been more active than normal, in large part because of El Niño.

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  • ChatGPT uses less water than almonds?
    Sam Altman, co-founder and CEO of OpenAI, testifying before a Senate committee in 2025.

    Topline:

    As Gov. Gavin Newsom weighs whether to require data centers to disclose how much water they use, OpenAI CEO Sam Altman says concerns over AI’s water use don’t hold “up to any scrutiny.”

    Why now: On the Sources Podcast with Alex Heath released Tuesday, Altman said that it takes 38,000 ChatGPT queries to use as much water as producing a single almond in California.

    So is he right? Keep reading to find out.

    As Gov. Gavin Newsom weighs whether to require data centers to disclose how much water they use, OpenAI CEO Sam Altman says concerns over AI’s water use don’t hold “up to any scrutiny.”

    On the Sources Podcast with Alex Heath released Tuesday, Altman said that it takes 38,000 ChatGPT queries to use as much water as producing a single almond in California.

    “If you look at a modern very large data center, it uses the equivalent amount of water as an office building in terms of, you know, people like running the sinks and the toilets and whatever,” Altman told Heath.

    The problem, experts say, is that it’s impossible to verify those numbers given what’s public about the secretive industry.

    “The information we have is so limited,” said Shaolei Ren, a professor of electrical and computer engineering at UC Riverside.

    Far too many factors affect how much water data centers use to boil it down to any one convenient statistic, Ren said, rattling off a handful of variables: the data center’s location, the temperature outside, the type of cooling system, the length of the prompt, the reasoning required, the output. All affect how much water the data center uses.

    “This is the whole reason that these bills need the governor’s signature,” said Michael Kiparsky, director of the Wheeler Water Institute at the UC Berkeley Center for Law, Energy, & the Environment. “There’s no published data — certainly not for California — and what is public seems all over the place.”

    Over the past two weeks, California lawmakers passed two bills by Assemblymember Diane Papan aimed at increasing transparency; both now await Newsom’s signature.

    One would require operators to report their water sources and usage when seeking business permits. The other would block local governments from approving new data centers unless developers disclose their water plans. They’d also have to pay for any water upgrades needed to connect to the local supply.

    It’s the San Mateo Democrat’s second attempt at more transparency around data center water use. Newsom vetoed her bill last year, saying he was “reluctant to impose rigid reporting requirements … without understanding the full impact on businesses and the consumers of their technology.”

    The heavy-hitting tech industry and business groups again opposed the bills. But now, as data center fights erupt across the state and local governments ban the facilities outright amid a wider bipartisan backlash, the question of how much water data centers really use is gaining urgency.

    “If we know what an almond uses, maybe we can figure out what a data center uses?” said Alex Biering, director of policy advocacy who specializes in water issues for the California Farm Bureau Federation.

    What the data actually shows

    Regardless of whether it takes thousands of queries to match the water needed to produce a single almond in California (a number that varies substantially over time and space, according to a 2019 study), the Congressional Research Service says data centers are using more water than they used to. 

    One study reported the facilities directly used about 17 billion gallons in 2023, up from 5.6 billion gallons in 2014. Another report found that hyperscale data centers could use 150 billion gallons of water from 2025 to 2030 — which is as much water as 4.6 million households use in the U.S. in a year.

    Annual water use isn’t the whole story, Ren cautioned. The hottest days, when data centers require the most cooling, can substantially increase peak water demand, according to Ren’s research, which is under review by a scientific journal and available online as a preprint.

    “For community water systems, the peak capacity is more important because they need to be designed and built to accommodate the peak demand at all times, similar to our power grid,” Ren said.

    Ren’s team found that data center cooling systems could call for 697 to 1.45 billion more gallons of peak water capacity per day. It’s comparable to New York City’s average daily supply, the study says. And unlike irrigation water typically used for farms, water for data centers is often treated, potable water from public water systems, the team reported.

    That’s a problem, because water systems across the country — and certainly in California — are “aging, fragmented, and/or financially constrained, thus lacking sufficient available capacity to meet the additional peak water demands of large data centers.”

    The researchers pointed to examples in Georgia and Virginia where water suppliers worried they “just don’t have the water” to accommodate peak demand from the data centers drawing from their systems simultaneously.

    Ren said water use could drop by as much as 50% if data centers opt for less water-intensive cooling systems, like dry cooling, but there are tradeoffs — such as increased energy needs.

    And that, too, requires water.

  • Bass and Raman lay out environmental platforms
    Two women in suit jackets hold mics and gesture as the address an audience.
    L.A. Mayor Karen Bass and Councilmember Nithya Raman separately explain their environmental positions at a mayoral forum held Thursday at L.A. Trade Tech in downtown Los Angeles.

    Topline:

    The two candidates for L.A. mayor defended their environmental records and painted two different pictures of the city on Thursday during a forum on climate and environment issues.

    The details: Incumbent Mayor Karen Bass and City Councilmember Nithya Raman each answered questions separately about how they would approach many environmental challenges facing the city, including emergency preparedness, water resiliency and transportation policy.

    The takeaways: Bass said L.A. has made solid progress on transitioning to clean energy and other environmental challenges, while Raman argued the city has fallen behind. Bass defended her role in the city’s response to the Palisades and Boyle Heights warehouse fires, while Raman criticized it for lacking effective guidance and communication for victims.

    Read on…for more takeaways from the forum.

    With a little more than two months to go until the general election, the two mayoral candidates running to lead the city of Los Angeles fielded questions about the environment at a Thursday night forum hosted by LAist.

    Incumbent Karen Bass and her challenger, L.A. City Councilmember Nithya Raman, each answered questions separately about how they would approach many environmental challenges facing the city, including emergency preparedness, water resiliency and transportation policy.

    These and other environmental and climate issues are top of mind for many Angelenos during a summer marked by extreme heat, humidity and the Lineage warehouse fire in Boyle Heights that affected surrounding neighborhoods for months. Communities are also still rebuilding from last year’s destructive Eaton and Palisades fires.

    The forum, held at Los Angeles Trade Technical-College, was organized by the L.A. League of Conservation Voters, SCOPE-LA, Sierra Club, Clean and Healthy California, Neighborhood Council Sustainability Alliance and Communities for a Better Environment, and was moderated by LAist climate and environment Reporter Erin Stone.

    Here are three takeaways from the event:

    Differing visions of LA

    Bass, who was elected mayor in 2022, painted a picture of an L.A. that’s made significant progress on environmental issues during that time, while Raman said the city has stalled under Bass’ leadership.

    Bass referenced her work transitioning the city off of coal-generated energy and expanding the city’s electric bus fleets and clean-energy jobs. She said she wants to build on that momentum, particularly with a focus on helping communities impacted by environmental and industrial pollution.

    She pointed to many communities of color that bear the brunt of industrial pollution, including in South L.A. neighborhoods dotted with oil wells and residents who live in close proximity to the Lineage warehouse in Boyle Heights.

    “Where we need to go now in the future is focusing on environmental justice, focusing on the communities that are disproportionately impacted by greenhouse gases and by the environment,” she said.

    Raman also talked about a need to focus on environmental justice, but she said environmental programs are underfunded and understaffed, and that she would invest more in them if she becomes mayor.

    She said Bass’ administration has not prioritized environmental climate issues enough, and that there should be a more aggressive policy around them.

    “Too much of that work remains unfinished,” she said. “Our transition to clean energy has slowed. Efforts to build a resilient water supply, close neighborhood drilling sites, make our streets safer, all of these have slowed over the last four years.”

    Raman specifically called out Bass for her proposal to cut funding for the Climate Emergency Mobilization Office as the city faced a billion-dollar budget shortfall last year.

    Bass defended the proposal, arguing the program had not developed a climate action plan as directed and needed to be revamped.

    The office has shrunk under Bass’ leadership, and she removed the city’s chief heat officer and quietly appointed a new one earlier this year.

    Emergency response failures

    Both Bass and Raman said L.A. has room for improvement when it comes to preparing for fires, earthquakes and other disasters.

    Raman criticized the city’s response to last year’s Palisades Fire, saying there was no clear leadership to guide the community through the recovery effort. She pointed to Bass' appointment of Steve Soboroff to head the recovery. He left the post after his three-month term and was not replaced.

     ”What we saw in the Palisades, I think, was an example of what shouldn't happen,” Raman said. “ A lot of residents in the Palisades have been feeling like they don't know who to reach out to, who is the person that they need to connect with in order to make sure that recovery really happens.”

    But she defended her administration’s response, and said confusion over city and state land made it more difficult.

     ”Part of the brush was the city, part of the brush was the state. There was a reluctance to go into state territory because our folks were told they couldn't do that,” Bass said. “As far as I'm concerned, that's not gonna happen again.”

    Bass said the biggest impediments to the recovery process — and to people moving back into their homes — are insurance companies and banks. She called for legislative reforms to the insurance process.

    Raman also criticized the response to the Lineage warehouse fire in Boyle Heights this summer, calling out Bass directly for sharing misleading information about air quality.

    Bass said she relied on inaccurate information from public health and air quality management officials.

    Both candidates said there’s a need for stronger enforcement and higher fines that could be levied against corporations like Lineage, the warehouse owner, and better planning for emergencies around industrial buildings.

    Shared goals

    Although the candidates leaned into their differences, the reality is that they align on many climate and environmental policies.

    Unhoused Angelenos are especially at risk from extreme heat, and Bass said the city needs to provide more places for them to cool off.

    “My plan, priority one, is to get people off the streets,” Bass said, adding that during heat emergencies that needs to include providing emergency shelters and other ways to cool off.

    Raman talked about similar solutions.

    “ Responding to people who are experiencing homelessness to ensure that they're actually able to get indoors and off the streets, so that they're not dying from exposure to heat, because that is a very, very high risk that people who are experiencing homelessness face,” she said.

    They had other shared goals.

    Both said incentives and rebates that keep down the cost of utility bills need to be more accessible, especially in low-income communities.

    Both called for more severe penalties for owners of industrial sites like the Boyle Heights warehouse.

    And they both said they want to grow the city’s electric vehicle fleet, and decrease car use by building more public transit ridership and expanding biking infrastructure.

  • Harmful algal bloom confirmed in Riverside County
    A boat on a lake with green algae.
    A boat motors through green water during a harmful algal bloom in at Lake Elsinore, in 2022. Now another Riverside County lake, Lake Hemet, is reporting issues.

    Topline:

    Visitors and residents are being warned to avoid swimming in another Lake Hemet heading into the long Labor Day weekend.

    The details: State water officials confirmed a harmful algal bloom there is showing up as green, cloudy discolored water, scum and algae.

    What's next: You can check California’s map to see if any harmful algal blooms have been reported in the area.

    Topline:

    Visitors and residents are being warned to avoid swimming in another Southern California lake heading into the long Labor Day weekend.

    The details: State water officials confirmed a harmful algal bloom in Lake Hemet that’s showing up as green, cloudy discolored water, scum and algae.

    Why it matters: The bloom can produce toxins that could cause you and your furry friends to get sick. People and pets are being urged to stay out of the water and away from any scum or algae along the shore. Dogs and children are especially vulnerable because they’re more likely to swallow water while playing and swimming, according to the State Water Resources Control Board. You can learn more about healthy water habits here.

    Why now: The warning for the Riverside County lake comes about a week after a similar alert was issued for Big Bear Lake. Lake Hemet is under an advisory until further notice, state officials said.

    The backstory: Harmful algal blooms are most common in California between the warmer months of late May through October, although they can pop up year round, according to the board.

    What's next: You can check California’s map to see if any harmful algal blooms have been reported in the area.

    Go deeper: What's the green sheen on Big Bear Lake? What you need to know about harmful algal blooms