(CNN) Swedish climate activist Greta Thunberg has a lot of fans -- and Leonardo DiCaprio is one of them.

The celebrated actor on Friday posted a photo of himself with the 16-year-old activist on Instagram.

"There are few times in human history where voices are amplified at such pivotal moments and in such transformational ways -- but Greta Thunberg has become a leader of our time," DiCaprio said in the caption

DiCaprio added that "history will judge us" for what the world does today for its future generations to give them "the same liveable planet" that has been taken for granted.

Like Thunberg, DiCaprio is also an environmental activist. His Leonardo DiCaprio Foundation "supports projects around the world that build climate resiliency, protect vulnerable wildlife and restore balance to threatened ecosystems and communities."