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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

SAN FRANCISCO (KGTV) -- The US Coast Guard in San Francisco said Tuesday rescued a man they say was bitten by a shark.According to the Coast Guard, the incident happened near the Farallon Islands. Authorities has to hoist the man into a helicopter after they say he was bitten on the hand or the wrist.At this time, it’s unknown what kind of shark attacked the man. 378

SAN YSIDRO, Calif. (KGTV)— The border shutdown at the San Ysidro Port of Entry Sunday created a ripple effect for transportation and nearby businesses.Many people were stranded at the port crossing for five hours before Homeland Security reopened the lanes in the evening. Christmas shopping at the Las Americas Outlet Mall came to an abrupt stop for Maria Martinez. "The mall was closed. They're very dangerous for us and the store,” Martinez said.RELATED: MAP: Migrant caravan forces closure of San Ysidro Port of Entry, San Diego interstatesThe Mexico City resident is on vacation to San Diego. She was shopping when she was told to leave the mall suddenly. Minutes prior, she claimed she saw a swath of caravan migrants rush the back of the mall, which the CBP denies."I saw the Salvadorenos people trying to cross the border,” Martinez said. “It was like watching a movie. I couldn’t believe it. I saw everything.”Customs and Border Protection closed off the San Ysidro Port of Entry late Sunday morning. Then the California Highway Patrol blocked off both the 805 and 5 Freeways south of the 905 interchanges. American federal agents in full tactical gear lined up along the border, at times using tear gas and rubber bullets to deter migrants.  "Over there, there was smoke and the noise of the gun,” Martinez said. At this point, there are no reports of any of the migrants successfully crossing the border. Martinez said she saw federal agents turn them around. The bus depot next to the mall was also closed, leaving shoppers like Martinez stuck and not knowing when they could get home. "I don't know. I think it's going to close the border. When everything is in peace, they are going to open. What time? I don't know,” Martinez said. By 5:15 pm, all operations at the San Ysidro Port of Entry resumed.  1883

SAN FRANCISCO, Calif. (AP) — Gov. Gavin Newsom says California is turning the corner in its fight against the coronavirus pandemic. He cited a significantly lower number of confirmed new cases as California begins to clear backlogged cases caused by a technical error. Newsom says he's also encouraged by the downward trend in hospitalizations, which have fallen 21% in the past two weeks. Dr. Roger Lewis, director with the Los Angeles County Department of Health Services, says there’s been “a clear decline” in hospitalizations there. California reported 180 additional deaths from the virus Wednesday, bringing the state's coronavirus deaths to more than 10,600. 674

back in 2017 that its towers had an average age of 68 years and some were more than a century old, the Journal said, reporting that the company also said it needed a plan to replace towers and better manage lines to prevent electrical conductors from falling on the ground and causing fires.Gusty winds that can topple trees and down power lines are concerns for California utilities. Last month, PG&E briefly cut power to thousands of people in selected portions of Northern California to guard against wildfires as the weather turned very windy, dry and hot.Also in June, PG&E said its workers discovered more than 1,000 high-priority safety risks on its transmission lines and distribution poles over several months of inspections and almost all of them had been fixed.A federal judge in San Francisco on Wednesday ordered PG&E to provide a "paragraph-by-paragraph" response to the Wall Street Journal story.PG&E must provide "a fresh, forthright statement owning up to the true extent" of the Wall Street Journal report by July 31, ordered U.S. District Judge William Alsup, who is overseeing PG&E's probation for a natural gas pipeline explosion in 2010 that killed eight people in San Bruno.Alsup also asked the company to explain its payment of billion in dividends in recent years "at a time when PG&E was aware of the problems" named in the Journal report.PG&E said it disagreed with the conclusions of the Journal report but "we have acknowledged that the devastation of the 2017 and 2018 wildfires made clear that we must do more to combat the threat of wildfires and extreme weather while hardening our systems.""As we have disclosed publicly, we are taking significant actions to inspect, identify, and fix these issues with our electric system," the utility said in a statement, adding that "while the number of safety issues we have identified on our electric system is small by percentage, it's unacceptable."PG&E filed for bankruptcy in January in the face of some billion in potential liability from 2017 and 2018 wildfire damage. 3356