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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

SANTEE, Calif. (KGTV) – Two teenaged girls had a frightening encounter with a stranger the parking lot Sportsplex USA Santee Thursday night.“He’s lucky I didn't walk out to minutes earlier,” Beau Branton said. His 14-year-old daughter was one of the girls involved.Branton plays in an adult softball league. Their game finished around 11 p.m. His daughter and her 13-year-old friend were there. After the game, they went to the pickup truck to get warm, while Branton finished up on the field.That’s when a man came over to the teens sitting in the car.“They saw him coming over and when they saw him coming over, they freaked out and locked it," Branton said. "He started yanking on the handle to get in.  When he realized he couldn't get in, he just stood there and didn't say anything, just a blank stare.”After a few seconds, the man seemed to give up and leave.“(My daughter) got out to come get me,” Branton said. “She came out from the truck, and towards the Sportsplex, that’s when (the stranger) came from behind a car and started chasing her.”His daughter got back into the truck in time to watch the man drive away.“He had a hoodie on, backpack,” he said, “cleanly shaven, he had two shaven notches on his eyebrows.  They watched him get into a red minivan and drive away.”San Diego Sheriff's Department said the suspect is described as a Hispanic man in his early 30s, about 5-feet 9-inches tall, and weighing about 170 pounds. He reportedly has short brown hair.He also had two shaved lines through his right eyebrow.The suspect reportedly fled in an early 2000's model, dark, red minivan with faded paint and a sticker on the back window.Deputies are working with the girls to create a sketch of the suspect and are asking any other witnesses to come forward.Lt. Chris Steffen says they are not yet sure of the man's intentions and that he might not have known the girls were in the car. But he says they take every case involving juveniles and strangers seriously.Anyone with information is asked to call SDSO at 858-565-5200.  2095

SAN MARCOS, Calif. (KGTV) — A 23-year-old man is behind bars after leading San Diego Sheriff's deputies on a short pursuit in a vehicle that was reported stolen.Deputies received a broadcast from Carlsbad Police of a stolen vehicle on Sunday just after 1 p.m. in the area of Palomar Airport Rd. heading toward San Marcos. Nearby deputies began searching the area and located the vehicle unoccupied in the parking lot of a Target on Business Park Dr. in Vista.While they waited for an ASTREA helicopter and canine unit, deputies set up surveillance on the vehicle. After a few minutes, the suspected driver, identified as Dylan Kidd, returned and deputies moved in toward the vehicle, according to the Sheriff's Department (SDSO).Kidd started up the vehicle and led deputies on a four- to five-minute pursuit, during which deputies say he drove recklessly out of the parking lot and onto nearby streets. Kidd eventually left the vehicle and fled into a nearby canyon, according to the department.The vehicle, however, continued and crashed into the garage door of a home on White Sands Drive, causing some minor damage.With the ASTREA helicopter above, deputies were led to Kidd's location after about six minutes and he surrendered to deputies, SDSO said. Kidd was booked into jail and charged with felony evading, vehicle theft, possession of a stolen vehicle, shoplift/burglary, and hit and run. 1405

SAN YSIDRO, Calif. (KGTV) -- Dozens of migrants seeking asylum in the United States are being processed Tuesday afternoon, according to an attorney.Eight migrants were allowed in for processing Monday night followed by dozens more Tuesday afternoon and evening. The rest of the migrant caravan is waiting in Tijuana to be allowed in and processed. The attorney, who is working with the group of migrants, said members of the caravan were asked to choose among themselves who would be processed.MAP: Where is the migrant caravan from?Women and children were reportedly in the first groups of migrants selected Monday and Tuesday. An official with U.S. Customs and Border Protection said that, although this group of migrants has been gaining national attention, the process the group is going through is standard.As far as the process the migrants are going through, CBP said that individuals who don’t have proper travel documents and try to enter into the U.S. may be subject to expedited removal.PHOTOS: Migrant caravan makes way to U.S-Mexico borderThose in expedited removal who express fear of return are then referred to United States Citizenship and Immigration Services.Migrants then go through a “fear interview” to determine whether or not they have a credible fear of persecution or torture.The San Ysidro border inspection facility can hold 300 people. Between October of 2017 and February of 2018, 8,000 asylum cases were processed.RELATED: Migrant caravan waiting for entry at US-Mexico borderAccording to a CBP spokesperson, port capacity at San Ysidro is dependent on holding space, volume of traffic, officer resources and complexity of cases among other factors.“CBP is committed to maintaining security and meeting the health and safety needs of those persons in our custody, the traveling public, and officers and personnel. At times, this has required us to limit the number of people we can bring in the port facility for processing at a given time, including in 2016 when an influx of Haitians arrived at the California border, and as recently as within the past six months. In recent days, San Ysidro has exceeded port capacity due to an increase in arrivals of undocumented persons making asylum claims or presenting complex cases. Accordingly, CBP has had to limit the number of new arrivals for processing. CBP will continue to work with its interagency partners at ICE to ensure continued management of persons presenting without documents and appropriate care and custody of all those in our facility,” the spokesperson said in part.Migrants with the caravan have made their trip to the U.S.-Mexico border from three different countries in Central America. Check out the map below:   2755

SANTA ANA (CNS) - A Colorado man was behind bars Wednesday on suspicion of killing an 11-year-old girl in Newport Beach in 1973, with authorities saying DNA technology helped them track down the suspect.James Alan Neal, 72, was arrested around 6:30 a.m. Tuesday in Colorado Springs, Colorado, in connection with the death of Linda Ann O'Keefe, who lived in Corona del Mar, Newport Beach police Chief Jon Lewis said.The girl disappeared while walking home from summer school on July 6, 1973, and her strangled body was recovered the following morning in a ditch in the Back Bay area. Police said the girl was last seen standing near a man in a blue or turquoise van.Lewis credited ``the latest in DNA technology'' for helping crack the case that has stymied investigators for more than four decades.``We have never forgotten Linda or the tragic events of July 1973,'' Lewis said at a news conference announcing the arrest. He said the girl's death changed the community, making parents think twice about letting their children outside alone.Neal has been charged with murder and District Attorney Todd Spitzer said the suspect could potentially face a death sentence, although there is some question about whether capital punishment could be applied in the case given the date of the killing and the laws that were on the books at the time.Newport Beach police last July mounted a Twitter campaign releasing information about the killing to try to spur new leads.The tweets detailing the last hours of Linda's life included photographs from the crime scene and a newly created ``snapshot'' of the suspect that was put together by scientists at Parabon NanoLabs. The tweets concluded with a video that included interviews with the detectives who have worked on finding the girl's killer through the years.Newport Beach police last year hired Parabon, a Virginia-based DNA technology company specializing in a process using genetic material, to build a sort of composite sketch of a suspect at 25 years old and how the killer might look today. 2048

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