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A locked-down pandemic-struck world cut its carbon dioxide emissions this year by 7%, the biggest drop ever, new preliminary figures show.The Global Carbon Project, an authoritative group of dozens of international scientists who track emissions, calculated that the world will have put 37 billion U.S. tons (34 billion metric tons) of carbon dioxide in the air in 2020. That’s down from 40.1 billion US tons (36.4 billion metric tons) in 2019, according a study published Thursday in the journal Earth System Science Data.Scientists say this drop is chiefly because people are staying home, traveling less by car and plane, and that emissions are expected to jump back up after the pandemic ends. Ground transportation makes up about one-fifth of emissions of carbon dioxide, the chief man-made heat-trapping gas.“Of course, lockdown is absolutely not the way to tackle climate change,” said study co-author Corinne LeQuere, a climate scientist at the University of East Anglia.The same group of scientists months ago predicted emission drops of 4% to 7%, depending on the progression of COVID-19. A second coronavirus wave and continued travel reductions pushed the decrease to 7%, LeQuere said.Emissions dropped 12% in the United States and 11% in Europe, but only 1.7% in China. That’s because China had an earlier lockdown with less of a second wave. Also China’s emissions are more industrial based than other countries and its industry was less affected than transportation, LeQuere said.The calculations — based on reports detailing energy use, industrial production and daily mobility counts — were praised as accurate by outside scientists.Even with the drop in 2020, the world on average put 1,185 tons (1,075 metric tons) of carbon dioxide into the air every second.Final figures for 2019 published in the same study show that from 2018 to 2019 emissions of the main man-made heat-trapping gas increased only 0.1%, much smaller than annual jumps of around 3% a decade or two ago. Even with emissions expected to rise after the pandemic, scientists are wondering if 2019 be the peak of carbon pollution, LeQuere said.“We are certainly very close to an emissions peak, if we can keep the global community together,” said United Nations Development Director Achim Steiner.Chris Field, director of the Stanford Woods Institute for the Environment, thinks emissions will increase after the pandemic, but said “I am optimistic that we have, as a society learned some lessons that may help decrease emissions in the future.”“For example,” he added, “as people get good at telecommuting a couple of days a week or realize they don’t need quite so many business trips, we might see behavior-related future emissions decreases.”___Follow AP’s climate coverage at https://www.apnews.com/Climate___Follow Seth Borenstein on Twitter at @borenbears .___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content. 3048

A Black man who says he was unjustly arrested because facial recognition technology mistakenly identified him as a suspected shoplifter is calling for a public apology from Detroit police. And for the department to abandon its use of the controversial technology.The complaint by Robert Williams is a rare challenge from someone who not only experienced an erroneous face recognition hit, but was able to discover that it was responsible for his subsequent legal troubles.The Wednesday complaint filed on Williams' behalf alleges that his Michigan driver license photo — kept in a statewide image repository — was incorrectly flagged as a likely match to a shoplifting suspect. Investigators had scanned grainy surveillance camera footage of an alleged 2018 theft inside a Shinola watch store in midtown Detroit, police records show.That led to what Williams describes as a humiliating January arrest in front of his wife and young daughters on their front lawn in the Detroit suburb of Farmington Hills.Related: Detroit demonstrators calling for city to cease use of facial recognition technology“I can’t really even put it into words," Williams said in a video announcement describing the daytime arrest that left his daughters weeping. "It was one of the most shocking things that I ever had happen to me.”The 42-year-old automotive worker, backed by the American Civil Liberties Union, is demanding a public apology, final dismissal of his case and for Detroit police to scrap its use of facial recognition technology. Several studies have shown current face-recognition systems more likely to err when identifying people with darker skin.The ACLU complaint said Detroit police “unthinkingly relied on flawed and racist facial recognition technology without taking reasonable measures to verify the information being provided." It called the resulting investigation “shoddy and incomplete," the officers involved “rude and threatening,” and said the department has dragged its feet responding to public-information requests for relevant records.Detroit police and Wayne County prosecutors didn't immediately return emailed requests for comment Wednesday.Related: Detroit police board votes to approve DPD's use of facial recognition technologyDataWorks Plus, a South Carolina company that provides facial recognition technology to Detroit and the Michigan State Police, also couldn't immediately be reached for comment.Police records show the case began in October 2018 when five expensive watches went missing from the flagship store of Detroit-based luxury watchmaker Shinola. A loss-prevention worker later reviewed the video footage showing the suspect to be a Black man wearing a St. Louis Cardinals baseball cap.“Video and stills were sent to Crime Intel for facial recognition,” says a brief police report. “Facial Recognition came back with a hit" — for Williams.At the top of the facial recognition report, produced by Michigan State Police, was a warning in bold, capitalized letters that the computer's finding should be treated as an investigative lead, not as probable cause for arrest.But Detroit detectives then showed a 6-photo lineup that included Williams to the loss-prevention worker, who positively identified Williams, according to the report. It took months for police to issue an arrest warrant and several more before they called Williams at work and asked him to come to the police department. It's not clear why.Williams said he thought it was a prank call. But they showed up soon after at his house, took him away in handcuffs and detained him overnight. It was during his interrogation the next day that it became clear to him that he was improperly identified by facial recognition software.“The investigating officer looked confused, told Mr. Williams that the computer said it was him but then acknowledged that ‘the computer must have gotten it wrong,’” the ACLU complaint says.Prosecutors later dismissed the case, but without prejudice — meaning they could potentially pursue it again.The case is likely to fuel a movement in Detroit and around the U.S. protesting police brutality, racial injustice and the death of George Floyd at the hands of police in Minneapolis. Detroit activists have presented reforms to the city's mayor and police chief that include defunding the police department and ending its use of facial recognition.Providers of police facial recognition systems often point to research showing they can be accurate when used properly under ideal conditions. A review of the industry’s leading facial recognition algorithms by the National Institute of Standards and Technology found they were more than 99% accurate when matching high-quality head shots to a database of other frontal poses.But trying to identify a face from a video feed — especially using the ceiling-mounted cameras commonly found in stores — can cause accuracy rates to plunge. Studies have also shown that face recognition systems don't perform equally across race, gender and age — working best on white men and with potentially harmful consequences for others.Concerns about bias and growing scrutiny of policing practices following Floyd's death led tech giants IBM, Amazonand Microsoft to announce earlier this month they would stop selling face recognition software to police, at least until Congress can establish guidelines for its use. Several cities, led by San Francisco last year, have banned use of facial recognition by municipal agencies. 5490

A couple arrested in Mexico while pushing a baby stroller filled with human body parts may have killed up to 20 women, according to the chief investigator on the case.The man and woman were detained Thursday in the Mexico City suburb of Ecatepec on suspicion of murdering 10 female victims. However, the male suspect has since claimed that they are responsible for twice as many deaths.Police arrested the pair, identified only as "Juan Carlos N." and his wife "Patricia "N.," during an investigation into the disappearance of three women and a two-month-old baby. The man gave detailed accounts of the original 10 deaths. He also told police that he and his wife had killed a further 10 people, according to State of Mexico Prosecutor Alejandro Gomez and reported by AFP.Police found eight plastic buckets full of dismembered body parts and cement in the couple's house, Gomez revealed in a Facebook post on Sunday. More remains were found in a refrigerator, wrapped in plastic bags. Tests are now being carried out on the grisly evidence. 1048

A Houston police officer was killed Tuesday and a second officer was injured on Tuesday morning in what Police Chief Ralph Acevedo called a "domestic violence-type situation."The officer killed was Officer Harold Preston, 65, a 41-year-old police veteran. Acevedo described Preston as a great cop "and a better person."According to Acevedo, officers were called to a home in the city's southwest side of the city by a woman who described herself as the estranged wife of the man who lived there. She said she was moving out and needed to collect her belongings, but her husband wouldn't let her in the house.When police approached the door, the suspect allegedly fired at the officers. Preston was shot multiple times in the head. A second officer, Officer Cortney Waller, was shot in the shoulder and is expected to survive.Several hours after police first arrived, the suspect emerged from the house and exchanged gunfire with police. The suspect, idnetified as Elmer Manzano, 51, was transported to the hospital and is expected to survive. Acevedo said Manzano will likely be charged with murder.Manzano's son was also injured in the incident and was transported to a local children's hospital with non-life-threatening injuries.KTRK-TV in Houston reports that Tuesday's shooting comes days after a Houston Fire Department Arson Investigator was shot and killed while doing surveillance in the northwest side of the city. 1432

A Florida sheriff’s office honored a four-month old dog it says showed the “tenacity” to be a deputy dog.In October, Gunner was locked in the jaws of an alligator in Lee County, Florida. The dog’s owner, Richard Wilbanks, jumped into the pond and fought off the alligator, allowing Gunner to make an escape.“We were just out for a Sunday morning stroll by a pond and Gunner, all of a sudden, I just heard him yelp,” Wilbanks said. “I looked around and saw the alligator swimming around the pond with him. I just jumped in the water and caught up with the alligator, got my heads on him and drug him up to the bank and pinned him down and pried his jaws open.”“Crazy story, happy to say Gunner is here today,” Lee County Sheriff Carmine Marceno said.Marceno bestowed Gunner with his badge this week after escaping the alligator."Do you swear to uphold the Constitutional law for the Lee County Sheriff's Office, Gunner? Ok. This is a big day, OK. You are going to be a detective now. Here we go,” Marceno said. 1017