UK's old trees critical to climate change fight- PublishedUK forests lock away twice as much planet-warming carbon as previously thought, a new study reveals.An accurate calculation of the amount of carbon trapped in UK woodland could help inform decisions about how to manage it - in addition to highlighting the cost to the environment of losing that woodland.That gave a measure of each tree's volume which the scientists used to calculate the amount of carbon captured in each tree's trunk and branches.It showed that a patch of UK forest weighs about twice as much as previous calculations suggested.Prof Disney says the new findings show that, for every square kilometre of woodland lost, "we potentially lose almost twice the carbon sink capacity we thought"."