With all the doomsday pronouncements about our world - or the near end of it - you might think loneliness comes way down the list of things to worry about. But it's a problem that's growing - and the dangers it poses are being recognised. Joining us on Skype from Cambridge, Massachusetts is Dr Jackie Olds, associate Professor of Psychiatry at Harvard Medical School. Here at the Roundtable is Dr Johanna Harris, Senior Lecturer at Exeter University and Convenor of the Exeter Care Homes Project, Eleanor Botwright, CEO of Castlehaven Community Association in London and Marjorie Wallace, founder and chief executive of mental health charity SANE. Roundtable is a discussion programme with an edge. Broadcast out of London and presented by David Foster, it's about bringing people to the table, listening to every opinion, and analysing every point of view. From fierce debate to reflective thinking, Roundtable discussions offer a different perspective on the issues that matter to you. Watch it every weekday at 15:30 GMT on TRT World.