Part activist and part globe trekking photographer, Sebastião Salgado is most famous for recording the migration of people and culture around the world. In this extensive conversation, Sebastiao Salgado revisits his adventurous career via the breathtaking images he captured.

泥土，看似不起眼，但每一把泥土当中却含有超过十亿的有机物质，而这些物质恰好就是维系交互作用以及地球生态平衡的重要角色，本片以幽默充实的方式，带领观众好好看看脚下土地的过去与未来。现在，一群拥有各种不同身分的人，从生物学家到美国克斯岛监狱当中的囚犯，他们集合在一起，要告诉所有人该如何解决人类所造成的土地危机，并保护这些对生态永续维系非常重要的泥土。
幕后制作
导演比尔·本内森和吉尼·络斯沃因为 William Bryant Logan的著作《The Ecstatic Skin of the Earth, Dirt!》而起了拍摄本片的念头，由非营利组织Common Ground Media公司制作，并获圣丹斯电影节最佳纪录片的提名殊荣。

史上第一次电视真人秀摄影比赛。来自欧洲各地的12位参赛者需要尽力向由专业摄影师组成的评委团证明，他们具备成为下一个摄影大师的天赋、技能和多样性。

Salgado spent 6 years traveling to over 40 countries , taking pictures of globalization and its consequences - most notably, the mass migrations of populations around the world. In the film, Salgado presents his remarkable photographs in conversation with John Berger.

During the last forty years, the photographer Sebastião Salgado has been travelling through the continents, in the footsteps of an ever-changing humanity. He has witnessed the major events of our recent history: international conflicts, starvations and exodus… He is now embarking on the discovery of pristine territories, of the wild fauna and flora, of grandiose landscapes: a huge photographic project which is a tribute to the planet's beauty. Salgado's life and work are revealed to us by his son, Juliano, who went with him during his last journeys, and by Wim Wenders, a photographer himself.