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Half of the coral populations in the Great Barrier Reef off Australia’s coast have been killed off because of warming ocean waters, a new study says.Between 25-30 percent of all marine species rely on coral reefs at some point in their life cycle. The Great Barrier Reef is the world’s largest coral reef, covering nearly 133,000 square miles.It has more than 411 species of hard corals documented, as well as 1,500 species of fish and other animals.Researchers looking at coral populations over 30 years starting in 1995 found there was decline in both shallow and deeper water, and across different species. They said two in particular, branching and table-shaped corals, were especially hard hit in 2016 and 2017 because of record-breaking temperatures.The study finds climate change to be a key driver in reef disturbances that disrupt recovery.“The potential for recovery of older fecund corals is uncertain given the increasing frequency and intensity of disturbance events. The systematic decline in smaller colonies across regions, habitats and taxa, suggests that a decline in recruitment has further eroded the recovery potential and resilience of coral populations,” the researchers note.They also say the coral that spawn the larvae that makes more coral have declined dramatically over large stretches of the reef.“Corals are tremendously resilient because of their capacity to produce millions of babies but they/we desperately need a break from disturbances,” Andreas Dietzel, a professor at the ARC Center and a co-author of the paper, said in an email to the Washington Post. 1600

Government watchdogs say President Trump’s Fourth of July gala in the nation’s capital last year cost taxpayers more than million, twice as much as previous celebrations. Each year, the nation's capital hosts Independence Day celebrations; a parade, concert, fireworks and, in 2019, "A Salute to America." Trump’s desire to have Department of Defense military vehicles participate last year helped drive up the cost, according to the Government Accountability Office. The president’s attendance also increased expenses. The report says that some other costs, such as for military flyovers of the National Mall, aren't included in the estimate. Trump’s military-focused Independence Day event went beyond the traditional concert and fireworks of years past. The GAO estimated that holiday celebrations from 2016 to 2018 cost from million to million annually. 875

Harvard University has announced plans to bring back up to 40 percent of their student body back to campus this fall.They also stated all course instruction at the undergraduate and graduate level will be delivered online, whether or not students are on campus. The fall semester begins on September 2 at Harvard.Those being allowed back to campus are all first-year students and those who must be on campus to progress academically. “This will enable first-year students to benefit from a supported transition to college-level academic work and to begin to build their Harvard relationships with faculty and peers,” the statement read.Harvard said this is only for the fall semester and if current restrictions are in place next year, their priority would be to bring back graduating seniors for their last semester on campus.Those coming back to campus will be tested for COVID-19 once they arrive, and then re-tested every three days while they are on campus.“Without a vaccine or effective clinical treatments for the virus, we know that no choice that reopens the campus is without risk. That said, we have worked closely with leading epidemiologists and medical experts to define an approach that we believe will protect the health and safety of our community, while also protecting our academic enterprise and providing students with the conditions they need to be successful academically,” read an online statement from University President Larry Bacow, FAS Edgerley Family Dean Claudine Gay, and Danoff Dean of the College Rakesh Khurana.The university’s statement says tuition for this upcoming school year will remain unchanged, at ,653.First-year students have until July 24 to defer their enrollment, and Harvard is making advisers available for older students considering a leave of absence. 1816

Frito-Lay is voluntarily recalling select half-ounce bags of Smartfood Delight Sea Salt Flavored popcorn due to an allergy concern.Certain bags of the popcorn product were inadvertently filled with cheese flavored tortilla chips that contain undeclared milk ingredients. The food item is sold individually and in two different variety packs."People who have an allergy or severe sensitivity to milk run the risk of a serious or life-threatening allergic reaction if they consume the product contained inside the recalled Smartfood Delight Sea Salt Flavored popcorn bags," the recall states.The popcorn was sold at retail locations in the following states: Alabama, Arkansas, Colorado, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Michigan, Minnesota, Missouri, Mississippi, North Carolina, North Dakota, Nebraska, New Mexico, Ohio, Oklahoma, South Carolina, South Dakota, Tennessee, Texas, Virginia, Wisconsin, West Virginia and Wyoming.They were also distributed through e-commerce websites.How can you tell if your food is affected? The recalled popcorn was packaged in variety packs that have these "use by" dates and 11-digit manufacturing codes printed on the outer packaging: 1241

HAMPTON ROADS, Va - From Los Angeles to Wrigley Field, Norfolk to Virginia Beach, strange signs are bubbling up on telephone poles across the nation."So I went old school put up about five fliers in my neighborhood and saw it worked really well," said D.C. resident Joe Kogan.Kogan who lives in the nation's capital has spent the last six months working to make his four-inch Pufferfish “Rona” Insta-famous."Once I got all-around D.C, I drove through all the surrounding areas then even drove to Virginia Beach, Norfolk, and Hampton, just looking for poles near people," said Kogan.Kogan has never owned a fish – quarantine piqued his interest in the underwater world, and his grassroots efforts have blown Rona into what he calls a "fin-influencer.""I am really glad I got her because she has been keeping everyone in this house sane," he said.She has more than 27,000 followers, more than the Virginia Aquarium."A lot of people think fish are kinda like gotta be weird to be a fish keeper and there is no respect in pet keeping community among fish," said Kogan. "I think Rona has put the fish keeping world on the map."The exotic fish dazzles followers daily with her live crawl fish feedings. She is still learning how to hunt and will soon reach her full size of two feet!"She is an underwater puppy and gets very excited to eat her food," said Kogan. People tell me all the time they love seeing the posts every day, I think it's really beautiful, to be honest."A Cinderella story about a colorful catch that has hooked the hearts of so many stuck at home.To follow Rona the Pufferfish click here.This story was first reported by Chelsea Donovan at WTKR in Norfolk, Virginia. 1689

来源：资阳报