Scientists are using the trees to study the climate in medieval times.
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Steffan Messenger
BBC Wales Environment Correspondent
BBC News Oxford
MoD police officer sentenced over stolen firearm
Roger Smith is sentenced over handling an assault rifle stolen from a British Army base.
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MoD police officer sentenced over stolen firearm
Roger Smith is sentenced over handling an assault rifle stolen from a British Army base.
Police stop publishing seized knives pictures
Thames Valley Police says it wants to "help reduce the fear of knives" and knife crime.
Case dropped against PC murder accused
The case against Jed Foster, 20, is "discounted", a court hears.
Partner's death was hard time, says Radiohead star
The singer also tells Desert Island Discs he is a "hypocrite" for flying while a climate campaigner.
Man arrested following fatal crash on M40
An unnamed van driver died at the scene following the collision on the southbound carriageway.
Man denies murdering his wife
Fatos Xheta, of Lytton Road, Cowley, denied one count of murder at Oxford Crown Court.
More than 4,000 drawn into 'county lines'
The Thames Valley is one of the areas targeted most by gangs supplying drugs.
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MoD police officer sentenced over stolen firearm
Roger Smith is sentenced over handling an assault rifle stolen from a British Army base.
Police stop publishing seized knives pictures
Thames Valley Police says it wants to "help reduce the fear of knives" and knife crime.
Case dropped against PC murder accused
The case against Jed Foster, 20, is "discounted", a court hears.
Partner's death was hard time, says Radiohead star
The singer also tells Desert Island Discs he is a "hypocrite" for flying while a climate campaigner.
Man arrested following fatal crash on M40
An unnamed van driver died at the scene following the collision on the southbound carriageway.
Man denies murdering his wife
Fatos Xheta, of Lytton Road, Cowley, denied one count of murder at Oxford Crown Court.
More than 4,000 drawn into 'county lines'
The Thames Valley is one of the areas targeted most by gangs supplying drugs.
Police stop publishing seized knives pictures
Thames Valley Police says it wants to "help reduce the fear of knives" and knife crime.
Case dropped against PC murder accused
The case against Jed Foster, 20, is "discounted", a court hears.
Partner's death was hard time, says Radiohead star
The singer also tells Desert Island Discs he is a "hypocrite" for flying while a climate campaigner.
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Lincoln produce a woeful display in front of new manager Michael Appleton as they went down 6-0 to Oxford.
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Roger Smith is sentenced over handling an assault rifle stolen from a British Army base.
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Rory Cellan-Jones
Technology correspondent
Also on the podcast: Will people buy Huawei phones without Google apps, and an interview with Microsoft.
Read moreOxford climate strike: 'It's not just our problem, it’s everybody’s'
Dave Gilyeat
BBC South
It's a beautiful sunny day in Oxford city centre as hundreds of cheerful protesters make their way down Broad Street.
The lively atmosphere is also down to the good-natured chants, and a jazz band that leads campaigners along like benevolent, funky pied pipers.
No one composes placards quite like the British, and a few of our favourites include: "I bet the dinosaurs thought they had time too" and "Worst Housewarming Ever".
Holding those banners are protesters of all age groups, from primary school children to people in mobility scooters.
Max Blansjaar, 16 (pictured second from right), came to the strike with several of his Culham school friends.
He says: "I’ve been coming to these since the first one in February. I think it’s a great movement and I’ve stopped eating meat now as well. You can talk about the problems we have but there comes a point when you have to do something.
"About half of my year group from school came which is pretty good.
"I’m really impressed with how many people have shown up. I’m really pleased there are so many adults here as well because I was afraid they’d be like ‘we support you’ and then not show up, but they have showed up which is great, and it’s a very lovely atmosphere.
"If we deal with this in the future it’s going to be way too late. This is not just our problem, it’s everybody’s problem, and we’re just telling people to do something.
"If that means giving up a day of education then that’s what we need to do."
From other local news sites
- Oxford colleges want to attract more pupils from North East
- Village needs new homes to attract young families
- John Deere walk-behind and ride-on mowers are on offer
- Road closed after car 'crashes into river'
- Youth council gets green light to form
- Giant fox and bee turn heads at annual town art and music festival
