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Trump announces sweeping new tariffs to promote US manufacturing, risking inflation and trade wars; Arizonans experience some of the highest insurance premiums; U.S. immigration policy leaves trans migrants at TX-Mexico border in limbo; Repealing clean energy tax credits could raise American energy costs.

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President Donald Trump announces worldwide tariffs. Democrats decry 'Liberation Day' as the economy adjusts to the news. And some Republicans break from Trump's trade stance.

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Rural schools face budget woes even as White House aims to dismantle the Department of Education, postal carriers argue against proposed USPS changes, fiber networks to improve rural internet may be supplanted by Musk's satellites, and PLAY BALL!

Study: L.A.’s urban trees remove more C02 than expected

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Monday, March 3, 2025   

A new study shows trees in mid-city Los Angeles absorb up to 60% of carbon dioxide emissions during spring and summer when the trees are most active.

In 2021, researchers from the University of Southern California placed 12 sensors in central L.A. to monitor carbon dioxide levels.

Will Berelson, professor of earth sciences, environmental studies and spatial sciences at the University of Southern California-Dornsife, said trees are surprisingly effective at lowering carbon dioxide levels in the air.

"The input of CO2 from cars is predicted to be a certain level," Berelson explained. "But when we look for CO2, we find much less. This difference is due to uptake of CO2 by trees."

Berelson pointed out emissions are like passengers on a train, as wind moves pollution through the city, where some get picked up and dropped off. The sensors measure the pollution in real time. The research published in the journal Environmental Science and Technology found trees absorb about 30% of carbon dioxide, averaged over 24-hour periods over a year. So clean energy, improved public transit and broader emissions reductions are still needed.

Berelson noted the sensors, called a Carbon Census Array, will track carbon dioxide levels for years to come.

"The City of L.A. is always committed to reducing emissions and it isn't clear how they're going to keep track of whether their emissions have actually lowered or not," Berelson observed. "But we've got a way to now track emissions and quantify emissions."

The sensor network is now being expanded, with 12 additional sensors reaching out to Santa Monica on the west side of the city.

Disclosure: University of Southern California Dornsife College of Letters Arts and Sciences and USC Price School of Public Policy contributes to our fund for reporting on Arts and Culture, Cultural Resources, and Social Justice. If you would like to help support news in the public interest, click here.


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