天津龙济秘尿外科地址(天津市龙济男科吗) (今日更新中)

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

Scientists and medical professionals across the country are working to learn about the coronavirus’s effect on children. There's still a lot they don't know about how the virus affects children.With children often not showing as many symptoms as adults, experts say kids can help us learn more about the novel coronavirus. Dr. Beth Thielen, a pediatric infectious disease physician and professor at the University of Minnesota, says people could be looking to children, especially as they go back to school, to find out more about the coronavirus."I mean, I hope so. I think this provides a very rich opportunity to understand a lot of basic things about the immune system and why diseases manifest differently in adults and children," says Dr. Thielen.Dr. Thielen says from possible protective measures of the MMR vaccine in children to t-cells, there's so much people can learn from how children's bodies combat viruses."It is thought that t-cells play a substantial role in helping to clear viral infections from the lungs. There are people looking at t-cell responses but they've lagged a bit behind with the data coming out on t-cell responses hasn’t been as prominent as the antibody studies," says Dr. Thielen. She adds, the reason people are looking at t-cells and children is because t-cells decline with age."I think they are critical. We all have them, they work to protect us from infection and potentially they are more efficacious in younger people potentially. Although, I think that really hasn’t been clearly worked out for SARS COV2," says Dr. Thielen.Dr. Jay Varkey, an epidemiologist at Emory Hospital in Atlanta, Georgia, agrees. Dr. Varkey says scientists are also looking into why children older than 10 years old, are more likely to have more serious symptoms with COVID-19."I think the reasons for that are complex. I think part of that might be related to some sort of existing t-cell immunity, and to what that is whether that’s to memory cells that are acting against a previous seasonal coronavirus that would just cause cold like symptoms, or whether its related to something more complex -- I don't think we’re there in terms of understanding," says Dr. Varkey.Dr. Varkey says, while children can help us understand COVID-19 better, it's also up to the adults to make sure they're growing up in a healthy, safe environment."We will learn much from kids but one of the messages we’ve been emphasizing in the hospital is that if we, again- and I answer this both not just as an infectious disease physician but also as a parent to two school age kids--we as adults have a responsibility to try and make our community safe to actually allow in-person learning," says Dr. Varkey."I think that we often think of children as getting a lot of these infections and the fact of the matter is most adults are getting exposed, as well, but our immune systems are sort of experienced at seeing them and we don't get sick," says Dr. Thielen.Dr. Thielen is a member of the Pediatric Infectious Disease Society and says she and other doctors in their scientific groups are advocating for more pediatric research to truly understand how certain diseases, including COVID-19, behave in children. 3217

SAN MARCOS, Calif. (KGTV) – Authorities have identified the victim and suspect after a man and a woman were found dead in a San Marcos home Monday. The Medical Examiner identified the victim as Michelle Johnson, 43, as the victim and Tiko Leal, 49, as the suspect. Deputies were called to the home on the 1000 block of Lanza Court early Monday morning after receiving reports of unknown trouble. Neighbors told deputies that two children, ages 10 and 11, were inside the home and afraid to come out. After entering the home, Johnson and Leal were found unresponsive with trauma to their bodies, according to the department. Both were pronounced dead at the scene.According to the department, there are no outstanding suspects.Anyone with information is asked to call the sheriff’s homicide unit at 858-285-6330 or Crime Stoppers at 888-580-8477. 854

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) - The standoff that had part of an east county neighborhood shut down is now overSan Diego's Sheriff's Department responded to an individual that was under duress on Graves Ave in Santee around 7 p.m.Deputies say the man was armed and waved a gun at them at one point when they had him surrounded in a field.The intersection of Graves Ave and Prospect Ave was blocked off for several hours as negotiators tried talk to the man.The man surrendered just after 11 p.m. according to the San Diego Sheriff's Department. 544

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