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WASHINGTON (AP) — For much of the United States, invasive grass species are making wildfires more frequent, especially in fire-prone California, a new study finds.Twelve non-native species act as "little arsonist grasses," said study co-author Bethany Bradley, a University of Massachusetts professor of environmental conservation.Wherever the common Mediterranean grass invades, including California's southern desert, fires flare up three times more often. And cheatgrass , which covers about one-third of the Intermountain West, is a big-time fire promoter, Bradley said."I would not be surprised at all if invasive grasses are playing a role in the current fires but I don't think we can attribute to them directly," Bradley said.University of Utah fire expert Phil Dennison, who wasn't part of the study but says it makes sense, said, "In a lot of ways, California was ground zero for invasive grasses. Much of California's native perennial grassland was replaced by Mediterranean annual grasses over a century ago. This study doesn't look at invasive grasses in the areas that are burning in California, but invasive grasses are contributing to the fires there."Experts say the areas burning now in California are more shrubs and grasses than forests, despite what President Donald Trump tweeted over the weekend."This is a global problem," said University of Alberta fire expert Mike Flannigan, who wasn't part of the study but said it makes sense. "I think with climate change and human assistance we are moving to a grass world. One region they should have mentioned is Hawaii where wildfires are increasing in large part due to invasive grasses."Invasive species are spreading more because of climate change as warmer weather moves into new areas, said study lead author Emily Fusco, also of the University of Massachusetts. New England and the Mid-Atlantic are seeing new invasive and more flammable grasses, Bradley said.The study in Monday's journal Proceedings of the National Academy of Sciences looks at the connections between a dozen species of invasive grasses and fires nationwide, finding fires occur more often in places with the non-native grasses. But the study did not find a link between invasive grasses and the size of the fires.Four of these species, including cheatgrass and common Mediterranean grass, are in California. These grasses get dry and then watch out, Fusco said."When you start a fire normally you want kindling," Fusco said. "The grasses are, more or less, like kindling"If someone lights a match and throws in the middle of a forest, it is unlikely a fire will start, but throw it in a field of cheatgrass "and odds are that it's going to catch," Bradley said."We are the reason that invasive species are here. We are the reason that they get spread around," Bradley said.Flanagan noted that invasive plants that are not grasses also feed the wildfire problem.While most outside experts said the study was important, wildfire expert LeRoy Westerling at the University of California, Merced said that with wildfires the size is key so this study is less valuable because it measures frequency.While size matters in forest fires, study author Bradley said mid to small size fires are the ones "in everybody's backyard" and affect people and their buildings more. 3313

WASHINGTON — U.S. health regulators posted a positive review of Pfizer's COVID-19 vaccine as they near a decision on whether to allow use of the shot. The review posted online Tuesday by the Food and Drug Administration offers the world the first detailed look at the evidence behind the shot, which was co-developed with BioNTech. The FDA review comes before a Thursday meeting where a panel of independent experts will scrutinize the data and vote on whether to recommend use of the vaccine.The vote isn't binding but the FDA usually follows the group's guidance. A U.S. decision to allow use of the vaccine is expected within days. 642

WASHINGTON — The number of Americans applying for unemployment benefits rose last week to 778,000, evidence that the U.S. economy and job market remain under strain as coronavirus cases surge and colder weather heighten the risks. The Labor Department’s report Thursday said jobless claims climbed from 748,000 the week before. Before the virus struck hard in mid-March, weekly claims typically amounted to roughly 225,000. They shot up to 6.9 million during one week in March before dropping yet remain historically high more than eight months later, with many businesses unable to fully reopen. 604

VISTA, Calif. (KGTV) - For the third time in recent months, a local Boy Scout troop is coping with a heartbreaking theft.As they were getting ready to leave on a camping trip Friday, Boy Scout Troop 722 in Vista realized their camping trailer was gone.Without a trailer, future trips are now in jeopardy.The trailer was parked in the St. Francis of Assisi Catholic Church parking lot when someone broke the padlock and stole the trailer. Because the troop has dealt with vandalism in the past, all their gear is kept in a shipping container. The trailer has a unique bolt on its door, which was put in to prevent people from breaking in.Replacing the trailer will cost the troop ,000.Community members can donate on a Go Fund Me page set up for the troop. If you spot the trailer, contact the Vista Sheriff's Department.In September, a Chula Vista Troop's trailer was stolen, as well as one earlier this month one in University City. Investigators are not sure whether any of the cases are related. 1013

WASHINGTON — The Washington D.C. Department of Health has released an open letter appealing to all White House staff and those attending a Sept. 26 event in the Rose Garden to seek medical advice and take a coronavirus test.The letter indicates a lack of confidence in the White House medical team’s contact tracing efforts for the virus outbreak that infected President Donald Trump, multiple senior staff members and two U.S. senators, among others.Co-signed by nine other local health departments from neighboring jurisdictions in Maryland and Virginia, the letter says contact tracing on the outbreak has been insufficient and “there may be other staff and residents at risk for exposure to COVID positive individuals.”The move highlights the public health dilemma faced by Mayor Muriel Bowser’s administration regarding the current outbreak. The Trump White House has operated for months in open violation of several D.C. virus regulations, hosting multiple gatherings that exceeded the local 50-person limit and where many participants didn’t wear masks. 1068