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Sunday, April 27, 2025

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White House is 'close' on Japan, India tariff agreements but expect them to be light on specifics; Families in limbo following federal energy assistance program cuts- we have reports from NH and MD; NV adopted CA's 'clean car' standard, rule now under GOP examination.

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Educators worry about President Trump's education plan, as federal judges block several of his executive orders. Battles over voting rules are moving in numerous courts. And FSU students protest a state bill lowering the age to buy a gun.

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Migration to rural America increased for the fourth year, technological gaps handicap rural hospitals and erode patient care, and doctors are needed to keep the Eastern Band of Cherokee Indians healthy and align with spiritual principles.

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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