The Billion Agave Project is a game-changing ecosystem-regeneration strategy recently adopted by several innovative Mexican farms in the high-desert region of Guanajuato. This strategy combines the growing of agave plants and nitrogen-fixing companion treespecies (such as mesquite), with holistic rotational grazing of livestock. The result is a high-biomass, high forage-yielding system that works well even on degraded, semi-arid lands. The system produces large amounts of agave leaf and root stem—up to one ton of biomass over the 8-10-year life of the plant. When chopped and fermented in closed containers, this plant material produces an excellent, inexpensive (two cents per pound) animal fodder. This agroforestry system reduces the pressure to overgraze brittle rangelands and improves soil health and water retention, while drawing down and storing massive amounts of atmospheric CO2.