In this task, you are given news articles and you need to generate a highlight, i.e., a short summary, with a maximum length of 10 lines.

Input: Consider Input: (CNN) -- When the average person contemplates the issues surrounding landfills, it's doubtful they give much consideration to the tons of food that fill them. Food biodegrades so where is the problem? The problem, environmentalists say, is just that. When food rots, it releases methane, a greenhouse gas which the U.S. Environmental Protection Agency (EPA) says is 20 times more damaging to the environment than carbon dioxide (CO2). Rotting food in a landfill in Canterbury, England. The developed world chucks out a lot of food. Such is the volume that according to the U.S. Department of Agriculture (USDA), if just 5 percent of Americans' food scraps were recovered it would represent one day's worth of food for 4 million people. The U.N. World Food Programme offers another way of looking at it: It says the total surplus of the U.S. alone could satisfy "every empty stomach" in Africa (France's leftovers could feed the Democratic Republic of Congo; and Italy's could feed Ethiopia's undernourished). Proportionately, the UK and Japan have traditionally been among the worst offenders worldwide in recent years when it comes to food waste, discarding between 30 and 40 percent of their food produce annually. The figures for how much the U.S. throws out, however, vary considerably depending on whom you ask. According to the USDA, just over a quarter of the country's food -- about 25.9 million tons -- gets thrown in the garbage can every year. But according to a study conducted by the University of Arizona, that figure could be as high as 50 percent, as the University claims that the country's supermarkets, restaurants and convenience stores alone throw out 27 million tons between them every year (representing $30 billion of wasted food). Either way, it still costs the U.S. around $1 billion every year just to dispose of all its food waste, according to the EPA. But moral and economic issues aside, it is the environmental concerns around food waste that is driving the push for reform on how to treat the problem of leftovers. Methane, the gas food waste produces, traps 23 times as much heat in the atmosphere as the same amount of CO2, the EPA says. And landfills are the place you will find most of it -- they account for 34 percent of all methane emissions in the U.S. The University of Arizona believes that if Americans cut their food waste in half, it would reduce the country's environmental impact by 25 percent. The UK's Waste & Resources Action Program (WRAP) -- which says the entire food supply chain in the UK contributes 20 percent of its greenhouse gas emissions -- believes that if we stopped throwing out edible food, the impact it would have on CO2 emissions would be the equivalent of taking 1 in 5 cars off the road. But ironically, one of the solutions to dealing with food waste actually results in a product that could keep cars on the road: Biogas. Biogas is a by-product of a process called anaerobic digestion (AD). AD is a process where organic matter -- such as food waste -- breaks down in an environment with little or no oxygen, generating a natural gas made up of 60 percent methane and 40 percent CO2. It is the exact process, in fact, which goes on in landfills. But there is a difference. Whereas methane can be harmful to the environment in an open setting, such as a landfill, in controlled and closed settings such as a combined heat and power plant, it can be harnessed and converted into biogas, a renewable energy. And that energy can be used to provide heat, light and fuel. According to a study by the National Society for Clean Air, biogas-fueled cars can reduce CO2 emissions by anything from 75 percent to 200 percent compared to cars powered by fossil fuels. Most organic matter can be processed with AD. In the UK it is already being used to treat sewage, which Friends of the Earth (FOE) says, reduces CO2 emissions by 16 percent compared to traditional sewage treatments. According to the Chartered Institute for Environmental Health, gas from sewage waste and landfills is already being used to provide 650 MW of electricity to the UK's national grid, representing between 60 and 75 percent of the country's green energy (the UK is Europe's biggest producer of biogas). However, while the potential for food waste-as-energy seems big, the practical applications for it are currently very small (only 0.4 percent of the UK's food waste is processed by AD, for example), with critics of AD pointing out that the amount food waste can contribute to the energy supply are negligible to say the least. FOE itself admits that just 0.36 percent of the UK's electricity needs could be met by AD. And, if 5.5 million tons of food waste was treated by AD (the majority of the UK's annual 6.7 million tons of food waste) it could only generate enough electricity to power 164,000 houses. That being said, environmentalists will say, that's much better than getting that electricity from fossil fuels. And there has been a big push, in Europe in particular, to cut back on the amount of biodegradable waste that is being sent to landfills. According to the European Landfill Directive, the amount of biodegradable waste sent to landfills in member countries by 2020 must reach 35 percent of the levels reached in 1995. The country that is leading the way in putting its biodegradable waste mountains to good use -- particularly in the world of biogas-powered cars -- is Sweden. That country -- which plans to eliminate petrol and diesel vehicles from their streets by 2020 -- already has 7,000 biogas cars on the road. It also has 779 biogas buses and the world's first biogas train, which, according to The Ecologist, cost just 1 million euros ($1.4 million) to develop. E-mail to a friend . (Sources: Chartered Institute of Environmental Health; U.S. Environmental Protection Agency; Planet Ark; U.S. Department of Agriculture; University of Arizona; World Food Program; Waste & Resources Action Program (WRAP); Friends of the Earth (UK); National Society for Clean Air; The Ecologist; Just-food.com; Food Production Daily; Endhunger.org)

Output: 5 percent of American's leftovers could feed 4 million people for 1 day .
Disposing of food waste costs the U.S. $1 billion a year .
Rotting food releases methane, a more potent greenhouse gas than CO2 .
Methane can be harnessed to create clean energy for heat, light and fuel .


Input: Consider Input: Seoul (CNN) -- Is she or isn't she? Pregnancy rumors and speculation are swirling around the world but the lady in question is saying nothing. This could easily be about a Hollywood star but this time, we're talking about the world's most reclusive nation, North Korea, and its first lady. Ri Sol Ju, the wife of young leader Kim Jong Un, has not been seen in public for around two months, according to North Korea watchers. A photo released by the state-run news agency KCNA shows her back in public and wearing a long coat that could be hiding a bump. Ri watched a football match and attended a musical concert with her husband Monday to mark the 60th anniversary of the Kim Il Sung Military University. Read more: North Korea's leader still a mystery . South Korean media has kicked into overdrive to speculate on whether she is pregnant or whether she was kept out of the public eye as a disciplinary measure for a perceived slight. Local media has claimed she may have fallen out of favor for not wearing a lapel pin of the former leaders, a requirement for adult North Koreans. "Rumors first came out from officials who attended the same event," said Kim Yong-hoon, head of the North Korean desk at Daily NK, an online newspaper based in Seoul that focuses on North Korea. "They started questioning and speculating if she was pregnant and it has spread throughout the country and that's how we heard about the rumors." Kim says the interest in whether Ri is pregnant is far higher outside of North Korea than it is inside, according to his sources inside the isolated nation. Read more: Power consolidation inside North Korea . John Delury, assistant professor at Yonsei University says this global interest speaks volumes about the way any news about North Korea is handled. "Do we track the last time Michelle Obama showed up?" Delury says. "Our minds are so trained to do this with North Korea that we miss the bigger picture which is there is something new --and by almost international standards we could say more normal -- about the way she appears in public." By announcing Ri Sol Ju as his wife and having her accompany him on many public engagements, Kim Jong Un has shown a personality very different to his late father, Kim Jong Il. While producing a son and heir for a dynastic regime is considered very important, Delury points out "that's also true for the families of the 'chaebol' or business conglomerates of South Korea, for Hyundai and Samsung," he says. "Even in the U.S. and UK, powerful families are concerned about producing the next generation." Read more: Kim Jong Il's sushi chef returns after fleeing for life . Journalist Jungeun Kim contributed to this report .

Output: Rumors are swirling whether the first lady of North Korea is pregnant .
Ri Sol Ju, wife of Kim Jong Un, reappeared in public after a two-month absence .
Photo appeared in state media showing her wearing a long coat, sparking speculation .
Analyst: Rumors first started from North Korean officials who attended the same event .


Input: Consider Input: (CNN) -- One of the three guns Adam Lanza used to kill 20 children and six adults at an elementary school in Newtown, Connecticut, was a military-style semiautomatic rifle known as an AR-15. That surprised and shocked a lot of people unfamiliar with America's gun culture. They questioned why such weapons are available and why anyone would need them. "Personally I don't know how any ordinary citizen can justify owning an automatic or semiautomatic gun," writes CNN commenter Mark Smerkanich. "Can't we leave those guns to the trained military?" Self-described gun owner Julie Jones-Hawkins comments, "I ... fully support a ban on rapid-fire weapons. Any weapon that can take out an entire kindergarten class is a problem." Here are five reasons many gun owners say they want military style rifles: . 'Some people play golf, others bowl. I shoot' "Every month or so I take my guns out to the range and shoot. It's thrilling, exciting and a great way to vent," says Christopher L. Kirkman, a Florida-based military-style gun owner. Kirman was one of more than 100 gun enthusiasts who shared opinions on CNN iReport about owning firearms that would have been banned under the now-expired 1994 federal weapons ban. "Sure, I could try to say that the reason I own these guns is self-defense, but the truth of the matter is that, although they will technically serve this purpose, they are not why I own them," he says. Michigan gun owner Ethan Daniels describes his enthusiasm for his rifle more succinctly, saying, "I like to shoot, and that is one heck of a fun carbine to plink with." iReport: Tell us why you own your military-style weapon . Background can factor into a gun owner's choice of weapon. "The AR-15 is what I am used to from my extensive training as an airborne infantryman," writes Nathan Lee. "Because of my training, it's what I feel the most comfortable with." Another reason for these guns is hunting. The AR-15 is a "good hunting platform. I've hunted coyote with it," says CNN iReporter MVR155, who owns two of the weapons. He asked to remain anonymous. Owners of military-style rifles also use them to hunt deer and other game. But some states have banned the AR-15 and its .223 caliber for deer hunting. Related: Newtown shooter's guns: What we know . 'It's cool' It may not be the best or most important reason, but military-style weapons often appeal to the enthusiast side of the American gun owner. Just like many car lovers who dream of owning a Lamborghini, many gun owners get excited about the idea of owning an AR-15. "There are people who buy certain types of firearms because they have a certain image -- the AR-15 is one of them," says Austin Nikel, a former AR-15 owner in Boulder, Colorado. "One thing about this country is how Hollywood has glorified the image behind those certain types of weapons. A lot of guys grow up with GI Joe, and that image is extremely attractive. It grabs you and affects you. "A lot of people buy the AR-15 because, well, it's cool." Apparently it wasn't cool enough for Nikel to hold on to. He ended up selling his AR-15 to his father. iReport: Why some own military-style weapons . 'A part of history' "Since coming of age -- and in the decades since -- I have collected many different firearms, some of them historical pieces, some for sport, some of them even the so-called 'assault weapons' that are now a controversy," says iReporter Hrothgar01. "Guns like these are as much a part of the history of this country as the muskets carried by pioneers, the rifles toted by doughboys in the trenches, and the other arms that have served and protected throughout the years. To hold one in your hands, appreciate its history and design, and to be able to take that piece of history to the range and work -- it is a feeling that many people in this debate do not understand or appreciate." Related story: By the numbers: Guns in America . 'Protecting my family' "I believe the foremost person responsible for protecting my family and myself is me," writes iReporter ShortyDoowap, who owns a pair of AR-15s. "These rifles provide me with the tools to perform that duty. I don't own these guns to target shoot, though I do that with them. I don't hunt with them, though I could in a pinch." Parks says he "would not hesitate to use one to simply defend my home and family from a single intruder if it became necessary." Related: Parents defend right to keep guns in the home . In some home-protection situations, fans say military-style rifles are generally more accurate than handguns. Rifles are generally easier to learn how to shoot, say military-style rifle owners. Like most firearms, military-style weapons such as the AR-15 are semiautomatic -- increasing protection because the shooter can fire off many shots without having to manually chamber a new bullet. With a bolt-action rifle or pump-action shotgun, firing multiple shots takes more time. "When you weigh it all out, these types of guns are stigmatized," says iReporter MVR155. Military-style weapons look more dangerous than other guns, he says, but really, there are many weapons available which are just as lethal, but which are not designed in a military style. iReport: One gun owner's solution . 'Fascination with the Second Amendment' "I am a proud owner of an AK-47," writes iReporter INGunOwner. "It's a terrific gun. Lots of fun to shoot. I own an AK because of my fascination with the Second Amendment, which I view as a backstop protector of freedom. Many people would argue that we have no use for it today because the government is trustworthy. "However since it acts as a deterrent, we can never measure exactly how much it has been effective. Perhaps the notion that people feel safe with our government after over 200 years is a testament to the Second Amendment value in balancing power with the citizens." Related: Gun owners fear new legislation could tread on their rights . CNN's Henry Hanks contributed to this report.


Output: A military-style rifle was used in the Newtown, Connecticut, school shooting .
"Can't we leave those guns to the trained military?" asks a CNN commenter .
Many gun owners collect them, using them for hunting, target shooting and protection .
"A lot of people buy the AR-15 because, well, it's cool," says a former owner .