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Antarctic Glacier Saw the Fastest Retreat In Modern History

2 months 2 weeks ago
An anonymous reader quotes a report from CNN: An Antarctic glacier shrunk by nearly 50% in just two months, the fastest retreat recorded in modern history, according to a new study -- and the way it retreated could have big implications for global sea level rise. The Hektoria Glacier, roughly the size of Philadelphia, is on the Antarctic Peninsula, a spindly chain of mountains sticking off the continent like a thumb pointing toward South America. It is one of the fastest warming regions on Earth. Grounded glaciers like Hektoria, which rest on the seabed and don't float, generally retreat no more than a few hundred meters a year. But between November and December 2022, Hektoria retreated by 5 miles, according to the study published Monday in the journal Nature Geoscience. [...] Understanding more about why this happened is vital; if larger glaciers retreat at similar rates, it could have "catastrophic implications for sea level rise," the authors wrote in a statement accompanying the report. Antarctica holds enough ice to raise global sea level by around 190 feet. Models show that the latest time this kind of ice plain melting occurred was between about 15,000 and 19,000 years ago, "during a period of warming that ended the last Ice Age," notes the report. "[W]e hadn't seen it play out live before, certainly not at this rate," said Naomi Ochwat, a study co-author and postdoctoral associate at the University of Colorado Boulder.

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LADWP Says It Will Shift Its Largest Gas Power Plant To Hydrogen

2 months 2 weeks ago
Bruce66423 shares a report from the Los Angeles Times: The board of the Los Angeles Department of Water and Power on Tuesday approved a controversial plan to convert part of the city's largest natural gas-fired power plant into one that also can burn hydrogen. In a 3-0 vote, the DWP board signed off on the final environmental impact report for an $800-million modernization of Units 1 and 2 of the Scattergood Generating Station in Playa del Rey. The power plant dates to the late 1950s and both units are legally required to be shut down by the end of 2029. In their place, the DWP will install new combined-cycle turbines that are expected to operate on a mixture of natural gas and at least 30% hydrogen with the ultimate goal of running entirely on hydrogen as more supply becomes available. The hydrogen burned at Scattergood is supposed to be green, meaning it is produced by splitting water molecules through a process called electrolysis. Hydrogen does not emit planet-warming carbon dioxide when it is burned, unlike natural gas. [...] Although burning hydrogen does not produce CO2, the high-temperature combustion process can emit nitrogen oxides, or NOx, a key component of smog. [...] [T]he approved plan contains no specifics about where the hydrogen will come from or how it will get to the site. "The green hydrogen that would supply the proposed project has not yet been identified," the environmental report says. Industry experts and officials said the project will help drive the necessary hydrogen production. "Burning hydrogen produced by 'excess' solar or wind power is a means of energy storage," adds Slashdot reader Bruce66423. "The hard question is whether it's the best solution to the storage problem given that other solutions appear to be emerging that would require less infrastructure investment (think pipes to move the hydrogen to the plant and tanks to store it for later use)."

Read more of this story at Slashdot.

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