The US is sliding down the world happiness rankings - but it's the unhappiness of young people that's really dragging down the average. What has happened to make Gen Z so sad? And what can be done to turn the situation around?

Jan-Emmanuel De Neve (director of Oxford University’s Wellbeing Research Centre) has been analyzing the figures for the World Happiness Report. He offers advice to young people and parents, and looks at what happy young Lithuanians can teach the rest of the world.