Tennis is the world’s fifth most polluting sport – but GREEN GRAD Mathilde has rescued old balls, bisected cut them with an ingenious S-cut, coloured them with natural dyes, and slotted them into plywood for a softly-textured sound-absorbing screen. See SoundBounce at GREEN GRADS in GREEN LIVING on stand Z30;

www.greengrads.co.uk

@mwittock

GREEN GRADS is a platform for recent UK graduates with ideas to heal the planet. They are exploring sustainability, biophilia, and biodiversity. They are highlighting natural materials and finding new ways to use waste.