From VC Reporter by Shelby Maloney:
In the race against the clock to find new ways to fight climate change, Agromin, an Oxnard-based organic recycling company, plans to aid in the effort to modernize an ancient soil enhancement technology by developing its own version of a charcoal-like soil amendment known as biochar. Biochar is produced from organic biomass, or plant waste, and is known to have several environmental benefits, including carbon sequestration, the act of taking carbon out of the atmosphere.

Mashable:
Big Idea: Utilize organic waste to create carbon-negative charcoal, a substance that pulls CO2 from the air and helps crops grow taller and stronger.

Why It’s Working: Re:char’s mission is about providing farmers — both at home and in developing countries such as Kenya — with conservation-oriented soil-boosting complexes that can double food output compared to traditional farming methods.

ReChar started a Kickstarter project funding:
Black Revolution is a soilless growth media for plants containing biochar, coconut husk and compost. Biochar is a charcoal soil amendment made from waste that improves nutrient retention, offsets CO2 and has the potential to help feed our growing planet. Black Revolution is the world's first carbon-negative replacement for soil made entirely from waste. It's lighter than traditional soil, so it works great in rooftop or urban environments. The potting soil and chemical fertilizer industries are traditionally some of the most environmentally destructive in the world.

Chemical fertilizers require massive amounts of fossil fuels and pollute our rivers and streams. Potting soils contain peat moss and vermiculite: non-renewable resources mined from endangered areas around the world.