The Duchess said: “Girl Up members are organizing Black Lives Matter protests around the world, you are creating films to encourage your peers to become activist leaders, you are reforming the criminal justice system, you are telling your school boards we need more mental health resources for all ages, you are leading coalitions to end gun violence.
“You are standing up and demanding to be heard, yes, but you’re also demanding to own the conversation.”
She added: “I know you have already done so much and made so many people’s lives better.
“The moment we are living through right now asks all of us to do more. It’s a moment where your voices, and your action, have never been more urgently needed.”