Olivia planting tree in Hyde Park
Olivia Newton-John planted a tree in Hyde Park with the help of volunteers to launch her One Tree Per Child initiative.
The former Grease star, 64, aims to get every child under 10 to plant at least one tree with the help of their school and hopes to take the campaign across the world.
She is seeking to meet education ministers to add tree planting to primary school curriculums in schools all around the globe.