We developed a novel material, Carbon Cell, as a replacement for polystyrene (which takes over 500 years to degrade and persists in the environment as toxic trash). Predominantly fabricated from biochar, Carbon Cell is a carbon negative, high-performance, biodegradable expanding foam. It exhibits competitive compressive strength, durability, and excellent thermal insulation (benchmarked against other eco-style expanded foams). This makes it perfect packaging for a diverse range of customers who require high-performance packaging for their product.