Tomorrow is the international Day against nuclear tests and the Hollywood superstar has sought to raise awareness of this important date by posting a video on his social media site. "This day was established by the United Nations in 2009 to raise awareness about the devastating impacts of nuclear weapons testing on human lives and the environment.

"To mark the occasion, join me and hundreds of young people around the world in a global walk on August 29 to raise awareness and take action!," Michael Douglas says on the video.