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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 (AP) — The Saudi government recruited two Twitter employees to get personal account information of their critics, prosecutors said Wednesday.A complaint unsealed in U.S. District Court in San Francisco detailed a coordinated effort by Saudi government officials to recruit employees at the social media giant to look up the private data of thousands of Twitter accounts.The accounts included those of a popular critic of the government with more than 1 million followers and a news personality.It also alleged that the employees — whose jobs did not require access to Twitter users' private information — were rewarded with a designer watch and tens of thousands of dollars funneled into secret bank accounts. They were charged with acting as agents of Saudi Arabia without registering with the U.S. government.The Saudi government had no immediate comment through its embassy in Washington.Twitter acknowledged that it cooperated in the investigation and said in a statement that it restricts access to sensitive account information "to a limited group of trained and vetted employees.""We understand the incredible risks faced by many who use Twitter to share their perspectives with the world and to hold those in power accountable," the statement said. "We have tools in place to protect their privacy and their ability to do their vital work."Ahmad Abouammo, who left his job as the media partnership manager for Twitter's Middle East region in 2015, was also charged with falsifying documents and making false statements to obstruct FBI investigators — offenses that carry a maximum penalty of 30 years in prison if convicted.At his appearance in Seattle federal court Wednesday, Abouammo was ordered to remain in custody pending a detention hearing set for Friday.His lawyer, Christopher Black, declined to comment, as did Abouammo's wife, who did not give her name.Investigators alleged that a Saudi citizen working as a social media adviser for the Saudi royal family recruited Twitter engineer Ali Alzabarah. The two met in Washington. D.C., around the same time the adviser, Ahmed Almutairi, met with someone named in the complaint as Royal Family Member 1."Within one week of returning to San Francisco, Alzabarah began to access without authorization private data of Twitter users en masse," the complaint said.The effort included the user data of over 6,000 Twitter users, including at least 33 usernames for which Saudi Arabian law enforcement had submitted emergency disclosure requests to Twitter, investigators said.After being confronted by his supervisors at Twitter, Alzabarah acknowledged accessing user data and said he did it out of curiosity, authorities said.Alzabarah was placed on administrative leave, his work-owned laptop was seized, and he was escorted out of the office. The next day, he flew to Saudi Arabia with his wife and daughter and has not returned to the United States, investigators said.A warrant for his and Almutairi's arrests were issued as part of the complaint. 3032

SAN MARCOS, Calif. (KGTV) - Students at Cal State-San Marcos will spend time Tuesday and Thursday this week painting as a way to process their emotions in the wake of the school shooting in Parkland, Florida.They're making a pair of murals, in conjunction with the Art Miles Project.One mural features 17 peace signs, each with the name of one of the victims of the shooting. The other features a dove with 17 rays of color coming out of it, also honoring the victims.Organizers say it's their way to let the victims know they have support from all over. It also helps the people who are painting sort through their own emotions and grief."I see the healing power that it has," says Joanne Tawfilis, the Director of the Art Miles Project, which organizes the murals.She's been doing murals like this for 20 years. Every time there is a major shooting or natural disaster, she organizes a way for people to paint."It makes me feel good," she says. "But it also makes me feel sad that we’re in a state in the world that this violence continues."Over the last 20 years, the Art Miles Project has been involved in painting 5,000 murals in over 100 countries. All of the materials are donated.In addition to the two murals that students will paint at Cal State-San Marcos, Tawfilis says the public is invited to the Muramid Museum and Art Center this weekend to paint more. 1391

SANTEE, Calif. (KGTV) - A kindergartner walked out of his Santee school, crossed a busy four-lane road and made it to his home more than a mile away, his mother told 10News Thursday.The Cajon Park Elementary student had been placed in a 3rd grade classroom with his upperclassman buddy when his grandmother arrived to pick him up.According to the 5-year-old boy’s parents, the 3rd grade teacher told the boy to pack his things because he was going home and sent him to the office alone.The boy didn’t fully understand the instructions and walked past the office to his home, crossing busy Magnolia Ave.There is only one gate in and out of the school and the boy apparently passed through it undetected.School administrators noticed the boy was missing about half an hour later and told his grandmother, who panicked.The boy’s mother said she realized something was wrong when her doorbell camera sent an alert. She looked at the video and saw her son on the front porch with a woman approaching him.The woman turned out to be a school administrator who had been searching for the boy.Rob Cunningham has a kindergartner at the school and was concerned by the incident.“We trust the school to know where our child is when we drop them off and expect them to be here when we pick them up,” Cunningham said.Santee School District Superintendent Dr. Kristin Baranski responded to 10News’ request for comments, saying the boy was found safe within 15 minutes.She added the school has a practice of sending a buddy with younger children when they need to visit the school office but in this case, the guest teacher did not follow the practice.Administrators will put additional communication practices in place with guest teachers to make sure they are aware of the policy, Baranski said. 1789

SAN MARCOS, Calif. (KGTV) - A well known funeral home in San Marcos wants to add on-site cremation services, but the plan is facing pushback from the community.Allen Brothers Mortuary has filed paperwork with the City of San Marcos to start the project. Meanwhile, people who live nearby have started a petition online to stop it."If this project goes forth, there are serious health risks that could affect YOU," says the petition.The County of San Diego website lists several possible emissions from crematoriums, including, "oxides of nitrogen, carbon monoxide, volatile organic compounds, oxides of sulfur, particulate matter and toxic air contaminants. Emissions of mercury are a specific concern for crematories."It also discusses rules and state laws that companies have to follow to mitigate any emissions, including secondary chambers.People who live nearby say they're worried about the impact it could have on their lives."It's a little disconcerting," says Pam Davidson, who lives in Whispering Oaks Apartments across the street from the mortuary. "There are enough toxins in our environment and around here with traffic and everything like that.""Families have kids here," says Nemai Martinez, who also lives at Whispering Oaks. "We don't know about ashes going up into the air. Plus the smell."In addition to the apartment complex, the mortuary is within steps of the San Marcos Post Office, the San Marcos Senior Center, a small shopping complex and a community park and playground.Karen Allen, the owner of Allen Brothers, says her company is aware of the concerns and wants to make sure her company works with the community.The company sent a statement to 10News that reads, "Linda Allen has heard the concerns of the community and is and has been, an avid supporter and proponent of this community. She wants to be clear that whatever she does here would only be done with the support of her community. Linda and her company have been at this location for nearly 40 years and want to continue that relationship in perpetuity. We are working with our Environmental consultants on addressing the neighbors’ concerns and evaluating whether or not those can be mitigated. We will know more once the studies have been completed." Last year, a crematorium in National City sent black smoke billowing into the air for nearly 30 minutes after a door was mistakenly left open. People in San Marcos worry something similar could happen in their city."It's definitely a concern for the whole community," says Davidson.Right now, there are no votes planned on the project as the company works through the environmental review. 2640