Sir David Attenborough has spent decades traveling the globe to explore wild places. Best known for his work in radio and television, the 94-year-old has witnessed much damage to the earth and its ecosystem over the span of 60 years. The BBC reports he has joined Instagram in order to reach a broad audience with the warning that "the world is in trouble." He will be posting recorded videos explaining "what the problems are and how we can deal with them." He concluded his message by asking viewers: "Join me -- or, as we used to say in those early days of radio, stay tuned."