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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 YSIDRO (CNS) - Police have little to go on today in the case of a 19-year-old who was shot in San Ysidro, authorities said.According to the teen, he was standing on the street by himself around 11:50 p.m. Saturday when it happened, said Officer Robert Heims of the San Diego Police Department.``He heard his name called,'' Heims said. ``He then heard several shots and felt pain to his back.''The victim fell to the ground, Heims said.He wasn't able to provide police with any other information about what happened.The teen was taken to a local hospital with non-life-threatening injuries.Police ask anyone with information to contact the SDPD Southern Division at 619-424-0400 or Crime Stoppers at 1-888-580-8477. 726

SANTEE, Calif. (KGTV) --  A man is in the hospital tonight after trying to save his dogs in an apartment fire. The Santee Villas Apartments were roaring in flames Thursday night. One of the residents headed directly into the danger zone trying to save his two chihuahua. Melanie Jaracz watched in horror as her neighbor risked his life climbing through a window."They busted out the windows to that," said Jaracz. "He tried climbing through that and they kept dragging him back. Nobody could get him to come out because he was so worried about his animals."Santee fire crews say it started in a bottom unit and quickly spread to three others around it. First responders tried to revive one of the dogs but it was too late. The man was taken to the hospital to be treated for burns and smoke inhalation. The cause of the fire is under investigation.  887

SAN YSIDRO, Calif. (KGTV) -- San Diego Fire-Rescue is on scene of a brush fire burning in San Ysidro Monday afternoon. According to department spokeswoman Mónica Mu?oz, the fire sparked near State Route 905 west and Caliente Avenue in an area near San Ysidro High School. The fire burned about one and a half acres before the forward rate of spread was stopped. No structures were threatened and no one was injured, according to Mu?oz.Three San Diego Fire-Rescue engines and two federal fire brush engines and a helicopter team responded to the blaze. Watch video of the fire below: 591

SEMINOLE COUNTY, Fla — George Zimmerman, the neighborhood watchdog acquitted in the fatal shooting of Trayvon Martin, has been charged with stalking a private investigator.According to investigators from the Seminole County Sheriff's Office, Zimmerman threatened and harassed Dennis Warren, a private investigator, in December 2017.The findings were handed over to prosecutors in March and they have decided to move forward prosecution.Zimmerman was served on May 3.He is scheduled to appear in court on May 30 at 9 a.m. for an arraignment. 553

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