This looks like a good documentary to watch. Usually costs US$7 to buy or US$14.99 to watch it through Amazon US.

With an estimated 60 years of farmable soil left on Earth, The Need To GROW is a character driven story of innovators behind decentralized solutions and cutting edge technologies. Underdog leaders face unpredictable challenges as they fight to heal our broken food system and regenerate the planet's dying soils.