soil

Practical Engineering explains Mechanically Stabilized Earth, where layers of reinforcement make soil strong enough to hold heavy loads, shown with a sand structure supporting a car. It notes that MSE walls are everywhere in infrastructure.

Veritasium examines whether food has become less nutritious, weighing soil depletion, selective breeding and rising atmospheric CO2. It evidences nutrient decline even in weeds over a century and ties it to faster plant growth.

A short film from Agenda Gotsch introducing syntropic agriculture and Ernst Gotsch's agroforestry methods, made for COP21. It shows degraded land regenerated into productive forest farms.

Farmer Joel Salatin gives a TEDx talk on how well-managed grass and rotational grazing support sustainable farming and affect the climate. He draws on his work at Polyface Farm in Virginia.

A short documentary about Eric Maundu's Arduino-controlled aquaponics setup in West Oakland, where contaminated soil rules out ordinary farming. Fish and circulating water grow plants without soil.