You will be given a definition of a task first, then some input of the task.
In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

Image copyright Getty Images Image caption Transatlantic flights will be quicker coming from the US to Europe but significantly slower going the other way 
  
 Flights from the UK to the US could take longer due to the changes in the climate, according to a new study. 
  
 Global warming is likely to speed up the jet stream, say researchers, and slow down aeroplanes heading for the US. 
  
 While eastbound flights from the US will be quicker, roundtrip journeys will "significantly lengthen". 
  
 The University of Reading scientists believe the changes will increase carbon emissions and fuel consumption and potentially raise ticket prices. 
  
 The study has been published in the journal Environmental Research Letters. 
  
 Speedy streams 
  
 High altitude jet streams in the northern and southern hemisphere are the powerful winds that help move weather systems around the globe. 
  
 Air traffic normally tries to take advantage of these speedy flows of the Atlantic jet stream from west to east to reduce journey times on routes between Europe and North America. 
  
 This is one of the world's busiest routes with around 600 flights every day. 
  
 Previous studies have shown that climate change is likely to increase turbulence on these transatlantic flights. In this new study researchers modelled how atmospheric winds would change given a doubling of atmospheric CO2. 
  
 They fed the results into the same route algorithms that airlines routinely use to plan their transatlantic journeys. 
  
 Image copyright SPL Image caption Jet streams are found in both the northern and southern hemispheres 
  
 They found that the winds on the New York to London route will become 15% faster on average. 
  
 Flights from London will become twice as likely to take over seven hours while flights from New York will speed up and will become twice as likely to take under five hours and 20 minutes. 
  
 While on average, flights will only gain and lose a few minutes each way, the cumulative impact is "significant" says the study. 
  
 "If you look at the round trips, the eastbound flights are getting shorter by less than the westbound flights are getting longer," lead author Dr Paul Williams from the University of Reading told BBC News. 
  
 "So there is a robust increase in the round-trip journey time, which means planes spending longer in the air, when you add that up for all transatlantic aircraft you get an extra 2,000 hours of planes in the air every year, with $22 million extra in fuel costs and 70 million kg of CO2." 
  
 The researchers say the extra CO2 is the equivalent of the annual emissions of 7,000 British homes. 
  
 Carbon cost of flying 
  
 Image copyright Getty Images 
  
 In 2012, 2% of all human carbon emissions were result of plane emissions. 
  
 If air travel continues to grow at the predicted rate, it could contribute a considerably higher proportion by 2050. 
  
 Is jet travel becoming the dirtiest way to cross the planet? 
  
 Blowing hot and cold 
  
 While at present there is no firm observational evidence of changes in the jet stream, scientists point to the fact that the record time for a non-Concorde flight from New York to London is currently 5 hours and 16 minutes, set in January last year. 
  
 "We know what drives the jet stream, it's the temperature difference between the warm tropical regions and the cold polar regions at flight levels," said Dr Williams. 
  
 Media playback is unsupported on your device Media caption How jet stream could make UK-US return flights longer 
  
 "We understand what that temperature difference is going to do in response to global warming, it's increasing, we are very confident that the jet stream is increasing as a consequence." 
  
 The researchers believe that as well as worsening the environmental impacts of aviation, airlines are likely to increase ticket prices to cover their costs. 
  
 And while the study only applied to the London-New York route, the impacts on flights of changes in the jet streams are likely to be felt all over the world as these critical winds are found in both the northern and southern hemispheres. 
  
 Other scientists in this field welcomed the study. 
  
 "This study builds on the concept that my team published last year showing that there is a two-way relationship between climate change and air travel," said Dr Kristopher Karnauskas, from the University of Colorado, Boulder. 
  
 "I think these results are an important step forward in filling in the overall puzzle that is this intricate relationship that we humans have with the climate system." 
  
 Dr Gregor Leckebusch from the University of Birmingham said the study was sound and the findings were easy to comprehend. 
  
 "My meteorological basic instinct would exactly have predicted such a result (shorter eastbound times while longer westbound times), but it is difficult to quantify the net effect without a detailed study using a conceptual model and detailed computational efforts," he said. 
  
 Follow Matt on Twitter and on Facebook. ||||| Image caption Planes are already encountering stronger winds, scientists say 
  
 Flights across the North Atlantic could get a lot bumpier in the future if the climate changes as scientists expect. 
  
 Planes are already encountering stronger winds, and could now face more turbulence, according to research led from Reading University, UK. 
  
 The study, published in Nature Climate Change, suggests that by mid-century passengers will be bounced around more frequently and more strongly. 
  
 The zone in the North Atlantic affected by turbulence could also increase. 
  
 Reading's Dr Paul Williams said comfort was not the only consideration; there were financial consequences of bumpier airspace as well. 
  
 "It's certainly plausible that if flights get diverted more to fly around turbulence rather than through it then the amount of fuel that needs to be burnt will increase," he told BBC News. 
  
 "Fuel costs money, which airlines have to pay, and ultimately it could of course be passengers buying their tickets who see the prices go up." 
  
 Media playback is unsupported on your device Media caption Dr Paul Williams: "We've used one of the world's best climate models" 
  
 Dr Williams was presenting his research here in Vienna at the European Union Geosciences (EGU) General Assembly. 
  
 It was undertaken with Dr Manoj Joshi from the University of East Anglia. 
  
 The scientists concentrated their investigation on the North Atlantic corridor, which some 600 flights cross each day to go between the Americas and Europe. 
  
 They used a supercomputer to simulate likely changes to air currents above 10km in altitude, such as the fast-moving jet stream. 
  
 There is evidence to suggest this has been blowing more strongly, and under some scenarios could be prone to more of the instabilities associated with turbulence as the Earth's climate warms. 
  
 Image caption The zone in the North Atlantic affected by turbulence could also increase 
  
 Williams and Joshi compared what was essentially an unchanged ("pre-industrial") climate with one that contained double the carbon dioxide. This could happen in the 2050s on present trends. 
  
 The modelling suggested the average strength of transatlantic turbulence could increase by between 10% and 40%, and the amount of airspace likely to contain significant turbulence by between 40% and 170%, where the most likely outcome is around 100%. In other words, a doubling of the amount of airspace affected. 
  
 "The probability of moderate or greater turbulence increases by 10.8%," said Dr Williams. 
  
 "'Moderate or greater turbulence' has a specific definition in aviation. It is turbulence that is strong enough to bounce the aircraft around with an acceleration of five metres per second squared, which is half of a g-force. For that, the seatbelt sign would certainly be on; it would be difficult to walk; drinks would get knocked over; you'd feel strain against your seatbelt." 
  
 The Nature Climate Change study is said to be the first to examine the future of aviation turbulence. 
  
 Figures are hard to come by but the costs of air turbulence in terms of injuries, plane damage and post-incident inquiries are thought to be in the region of $150m (£100m) a year. 
  
 Detecting clear-air turbulence (unstable air in clear blue skies) by remote sensing is difficult. 
  
 Currently, pilots rely a lot on reports from planes that have already made the journey across the Atlantic earlier in the day for information about probable flight conditions. 
  
 Jonathan.Amos-INTERNET@bbc.co.uk and follow me on Twitter: @BBCAmos |||||
Output:
Planning a round trip from New York to London in the not-too-distant future? The good news: Getting to Heathrow may be quicker than ever at about five hours. The bad news: The flight back to the Big Apple could drag on for more than seven hours, making the overall trip longer. That's what researchers with the University of Reading predict in a new study that examines the effect of climate change on the jet stream, Phys.org reports. The high-altitude wind that blows west to east across the Atlantic Ocean is closely related to atmospheric temperatures, study lead Paul Williams says in a video. "Therefore, the winds are changing in response to the temperature changes." More specifically, the jet stream will become 15% faster, according to the study published this month in Environmental Research Letters. It all adds up for aircraft making the trip across the pond and back—some 600 flights daily. The BBC says the average time difference will be only "a few minutes each way," but it's the cumulative effect that researchers are worried about—it amounts to an extra 2,000 hours a year in the air, adding about $22 million to fuel costs and increasing CO2 emissions by 70 million kilograms. In 2013, Williams led a study predicting that transatlantic flights would become bumpier thanks to climate change, making for uncomfortable flights or longer flights as pilots burn fuel trying to avoid turbulence. This new study looks only at transatlantic flights, meaning it's "possible that flights elsewhere in the world will also suffer from a similar jet stream effect," says Williams. (You could soon fly from the East Coast to Europe for $69.)