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SAN FRANCISCO (KGTV) – The first case of coronavirus with unknown origin has been confirmed in Northern California. The resident hasn’t traveled overseas since the outbreak began, the CDC said Wednesday. It’s unknown how the patient got the virus. "At this time, the patient's exposure is unknown. It's possible this could be an instance of community spread of COVID-19, which would be the first time this has happened in the United States. Community spread means spread of an illness for which the source of infection is unknown," the agency said in a statement. RELATED: CDC: A clean shave lowers coronavirus chances when wearing a mask"It's also possible, however, that the patient may have been exposed to a returned traveler who was infected." The CDC says it’s working with the state and preparing for “possible community transmission.” The public health system in Northern California was able to catch the case. Meanwhile, San Diego’s second coronavirus patient was released from the hospital Monday. UC San Diego Health made said earlier in the week it was no longer caring for anyone with confirmed or possible cases of the virus. 1152

SAN FRANCISCO (AP) -- San Francisco police will stop responding to neighbor disputes, reports on homeless people, school discipline interventions and other non-criminal activities as part of a police reform plan announced Thursday.Mayor London Breed said officers would be replaced on non-violent calls by trained and unarmed professionals to limit unnecessary confrontation between the police department and the community.Breed said the city will develop the plan over the next year and follow models like the Cahoots program in the western Oregon city of Eugene.That community-based crisis program employs social workers and mental health workers to respond to disturbances where crimes are not being committed. 721

SAN FRANCISCO, Calif. -- Police in San Francisco made a horrifying discovery after a man was reported missing.According to KRON, police found the remains of a headless torso in a fish tank inside a San Francisco home.Neighbors hadn’t seen the homeowner in months and police were called to the home in July to do a wellness check, but men inside the home said the homeowner was simply on vacation.After returning to the house, police found the remains they say were so badly decomposed, they couldn't tell whether the victim was a man or a woman. One man was arrested in the case, but charges have yet to be filed. 626

SANTA CRUZ, Calif. (AP) — An active-duty U.S. Air Force sergeant accused of killing a Northern California sheriff’s deputy in an ambush-style attack was a leader for a military base’s elite security force. Officials said Monday that Staff Sgt. Steven Carrillo was a team leader for the Phoenix Ravens that protects airfields at Travis Air Force Base. Carrillo has been arrested on suspicion of fatally shooting Santa Cruz sheriff’s sergeant Damon Gutzwiller on Saturday afternoon in Ben Lomond, an unincorporated area near Santa Cruz. Carrillo is also accused of wounding two other officers.RELATED: Deputy killed, 2 other officers shot in California ambushThe FBI also is investigating if Carrillo has any links to the shooting death of a federal officer outside the U.S. courthouse in Oakland more than a week ago. 824

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

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