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Scientists are proposing an ingenious but as-yet-unproven way to tackle climate change: spraying sun-dimming chemicals into the Earth's atmosphere.The research by scientists at Harvard and Yale universities, published in the journal Environmental Research Letters, proposes using a technique known as stratospheric aerosol injection, which they say could cut the rate of global warming in half.The technique would involve spraying large amounts of sulfate particles into the Earth's lower stratosphere at altitudes as high as 12 miles. The scientists propose delivering the sulfates with specially designed high-altitude aircraft, balloons or large naval-style guns.Despite the technology being undeveloped and with no existing aircraft suitable for adaptation, the researchers say that "developing a new, purpose-built tanker with substantial payload capabilities would neither be technologically difficult nor prohibitively expensive."They estimate the total cost of launching a hypothetical system in 15 years' time at around .5 billion, with running costs of .25 billion a year over a 15-year period.The report does, however, acknowledge that the technique is purely hypothetical."We make no judgment about the desirability of SAI," the report states. "We simply show that a hypothetical deployment program commencing 15 years hence, while both highly uncertain and ambitious, would indeed be technically possible from an engineering perspective. It would also be remarkably inexpensive."The researchers also acknowledge potential risks: coordination between multiple countries in both hemispheres would be required, and stratospheric aerosol injection techniques could jeopardize crop yields, lead to droughts or cause extreme weather.The proposals also don't address the issue of rising greenhouse gas emissions, which are a leading cause of global warming.And despite the conviction of the report's authors, other experts were skeptical."From the point of view of climate economics, solar radiation management is still a much worse solution than greenhouse gas emissions: more costly and much more risky over the long run," said Philippe Thalmann of the école Polytechnique Fédérale de Lausanne, an expert in the economics of climate change.David Archer of the Department of Geophysical Science at the University of Chicago said, "The problem with engineering climate in this way is that it's only a temporary Band-Aid covering a problem that will persist essentially forever, actually hundreds of thousands of years for fossil fuel CO2 to finally go away naturally."It will be tempting to continue to procrastinate on cleaning up our energy system, but we'd be leaving the planet on a form of life-support. If a future generation failed to pay their climate bill they would get all of our warming all at once." 2830

SDCCU? Classroom HeroesTM is proud to honor Nancy Sandoval, who teaches fourth grade students at Oneonta Elementary School. Educators at Oneonta, located at 1311 Tenth Street in Imperial Beach, believe in collaborative learning for both students and teachers. Sandoval was nominated by several people, including her students, who offered many reasons why she was a Classroom Hero, including: “…because whenever she hears a problem or sees a problem or sees someone in need of help, she helps us all in many ways;” “…because she wants us to succeed in life;” “…because she is a super leader and she teaches us how to be a leader too;” and “Nancy Sandoval is an amazing teacher whose passion for teaching is evident in the way she makes learning a fun and positive experience.” 798

SAN FRANCISCO (AP) — The amount of snow blanketing the Sierra Nevada is even larger than the 2017 snowpack that pulled the state out of a five-year drought, California water officials said.As of Thursday, the snowpack measured 202% of average after a barrage of storms throughout winter and spring, according to the Department of Water Resources.The wet weather has slowed but not stopped, with thunderstorms prompting flash flood warnings Sunday in the central and southern parts of the state.At this time last year, the snowpack measured 6% of average — making this year 33 times bigger than 2018, the San Francisco Chronicle reported.In 2017, the snowpack measured 190% of average.The snowpack supplies about 30 percent of state water needs.In the Tahoe Basin, Squaw Valley ski resort has seen so much snow it plans to keep its slopes open until least July 5. In May alone, Squaw recorded 37 inches (94 centimeters).State officials consider the most important snowpack measurement to be the one taken around April 1 because that's typically when storm activity subsides."And then after that the sun's highest position in the sky contributes to rapid melting. This year, that didn't happen and we had late season snow," National Weather Service forecaster Idamis Del Valle told the newspaper.This year's April 1 reading put the snowpack at 176% of average, making it the fifth-largest on that date, with records going back to 1950, the Chronicle said.___Information from: San Francisco Chronicle, http://www.sfgate.com 1528

Sears, the once-dominant retail chain that changed how Americans shopped and lived, has filed for bankruptcy.The 132-year-old company has been struggling for several years and is drowning in debt. The final straw was a 4 million debt payment due Monday that it could not afford.Sears Holdings (SHLD), the parent company, which owns Sears and Kmart, is among dozens of prominent retailers to declare bankruptcy in the era of Amazon. (AMZN)The filing in federal bankruptcy court in New York came just after midnight early hours of Monday. The company issued a statement saying it intends to stay in business, keeping stores which are profitable open, along with the Sears and Kmart online shopping sites. But it said it looking for a buyer for a large number of its remaining stores and that it will close at least an additional 142 stores near the end of this year, in additional to the 46 store closing already planned for next month. 945

SAN FRANCISCO (KGTV) -- A California assemblyman from San Francisco wants to end tax breaks for companies that contract or subcontract the proposed border wall along the U.S.-Mexico border.Democratic Assemblyman Phil Ting said 375 companies are interested in the opportunity to work on the wall while 73 percent of Californians are opposed to the project.According to Ting, California is home to 2.7 million undocumented immigrants who make up 10 percent of the workforce.Assembly Bill 2355 would prohibit companies that contract to build the wall from benefiting from the tax exemptions listed below: 609