Hollywood action star and former California governor Arnold Schwarzenegger went cycling with Greta Thunberg.
He posted pictures on Instagram showing them cycling together around Santa Monica.
The 16-year-old climate change crusader Greta also met Arnold's daughter Christina.
Recently, Greta also met with Leonardo DiCaprio.
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There are few times in human history where voices are amplified at such pivotal moments and in such transformational ways – but @GretaThunberg has become a leader of our time. History will judge us for what we do today to help guarantee that future generations can enjoy the same livable planet that we have so clearly taken for granted. I hope that Greta’s message is a wake-up call to world leaders everywhere that the time for inaction is over. It is because of Greta, and young activists everywhere that I am optimistic about what the future holds. It was an honor to spend time with Greta. She and I have made a commitment to support one another, in hopes of securing a brighter future for our planet. #FridaysforFuture #ClimateStrike @fridaysforfuture