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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

SCOTTSDALE, Arizona — From pre-made salads and sandwiches to ready-to-make meal kits and online ordering, the grocery store has become a conveyor belt of innovation the last few years.It’s time to throw another piece into the basket — driverless delivery. Kroger, the Cincinnati, Ohio-based grocery chain that operates Fry’s Food Stores, announced Thursday, Aug. 16, that it will begin testing its driverless delivery program in Scottsdale, Arizona. In June, the company said it was exploring the program and had partnered with Nuro, a company founded in 2016 that makes unmanned vehicles, but had not named where they would be tested.Now we know where.Starting Thursday, the program will only be available to those living in the 85257 zip code and within two miles of the Fry’s grocery store at 7770 E. McDowell Road in Scottsdale (near Scottsdale and North Hayden Roads).Here are a few things you need to know:WHAT IS IT?Forget going to the grocery store and walking the aisles to grab the milk, eggs and cheese. Under the test program, customers will be able to order their groceries via the Fry's Food Store app and website and have them delivered to their home by one of Nuro’s ten unmanned Toyota Prius vehicles.Each vehicle will deliver the groceries to a home’s curbside and can deliver up to 15 bags of groceries, said Pam Giannonatti, corporate affairs manager with Kroger.HOW SAFE IS IT?“Safety is Nuro’s top priority. They are relentlessly focused on ensuring their vehicles are not just good neighbors, but among the safest on the road,” Kroger said in a statement. “Their vehicles and the autonomy systems undergo extensive testing including a wide range of critical safety scenarios that require immediate response to prevent harm.”During the test, Kroger said each vehicle would have a safety test driver with it.HOW DOES IT WORK?Starting Thursday, Aug. 16, those living within the 85257 zip code can order groceries from the Fry’s Food app or website, https://www.frysfood.com.They can be delivered by one of Nuro’s vehicles that same day or the next day depending on availability.The delivery fee is .95 per order. There is no minimum order amount.“Arizona is home to some of the most innovative autonomous vehicle testing,” said Dave Ferguson, Nuro’s co-founder, in a prepared statement. “We’re proud to contribute and turn our vision for local commerce into a real, accessible service that residents of Scottsdale can use immediately. “We welcome innovative technology that can benefit the lives of Scottsdale residents. We feel this partnership holds tremendous potential and promise, and offers our residents real, not-yet-experienced convenience for everyday routines," Scottsdale Mayor Jim Lane said in a statement.Some of Arizona's top leaders, including Gov. Doug Ducey, have been supportive of autonomous technology.Uber began testing its self-driving technology in Arizona in February 2017, but shut down its operations earlier this year after one of its vehicles was involved in a deadly crash with a pedestrian.Waymo, a subsidiary of Alphabet Inc., the parent company of Google, is also testing self-driving vehicles in Arizona.Kroger did not say how long the pilot test would last nor if — or when — more locations would be added. 3291

SAN MARCOS, Calif. — A report of a man shooting his wife at their North San Diego County home Tuesday may have been a swatting call, San Diego County Sheriff’s Deputies said.Deputies got a call indicating a man had opened fire on his wife at a home near San Elijo Park in San Marcos about 2:30 p.m. local time on Wednesday.Investigators surrounded the home, breaking down the door with guns drawn. They found the man unarmed on the balcony. No victim was in the home. Several schools were temporarily placed on lockdown. The man’s wife later arrived at the scene, unaware of the situation. The woman, who did not want to be identified, said she and her husband are gamers with millions of followers. "People always have an opinion and they may not like what you do or say and sometimes it’s taken to an extreme when they call the cops on you," said the man's wife. The wife said her husband had no idea deputies had entered the home until he heard shouting. He usually wears a headset while he's playing. "He heard 'this is the police' ... he took his headset off and he came downstairs, and he saw guns being pointed at him. He wanted to show his hands because he was afraid to get shot," she said. The call made to deputies was traced back to a doctor’s office in Michigan, according to the San Diego County Sheriff’s Department. Deputies confirmed the call was a hoax.Swatting is the practice of making a hoax call about a crime to draw law enforcement officers to a specific location.The San Marcos man said he had been playing an online game when the incident happened.This story has been updated from the initial Sheriff's Department report that a woman had been shot at the home.  1755

SAN YSIDRO, Calif. (KGTV) — Border officials seized more than million in unreported currency being smuggled into Mexico through San Ysidro.Officials stopped a vehicle on Dec. 9 in the southbound I-5 lane at the San Ysidro Port of Entry, according to U.S. Customs and Border Protection. The vehicle was referred to inspection where canine officers alerted CBP officers to the driver's side quarter panel of the vehicle.Officers discovered numerous packages containing undeclared U.S. currency in the quarter panel, under the vehicle's third row of seats, and in the cargo area, CBP says."CBP officers and a canine team successfully stopped the smuggling of the currency during outbound inspections," said Anne Maricich, Acting Director of Field Operations for CBP in San Diego. "This is a demonstration of great police work and dedication to the CBP mission by our officers with the goal of stopping the illicit movement of currency through the border."The money was seized by the CBP. 995

SAN MARCOS, Calif. (KGTV) — City officials in San Marcos held a ground-breaking ceremony Wednesday for a 0-million infrastructure project, designed to mitigate flooding.The project will help manage flooding along the San Marcos Creek using two new bridges and channelize parts of the creek. One bridge will be on Brent Avenue and the other will be on Via Vera Cruz. Both bridges will also include bike and pedestrian paths. The project is scheduled to begin in early 2020 and will take about two years to complete. For alerts and information, visit the City of San Marcos website. 591