The production of biochar takes typical coffee waste products and turns them into something useful. Image: Cotierra/Julian Guerrero. Neumann Kaffee Gruppe and its partners are scaling biochar in Colombia, transforming coffee waste into a super substance contributing to sustainability goals. Across Colombia, coffee producers are grappling with declining soil fertility and increasingly unpredictable weather, while rising costs of inputs are becoming harder to absorb. At the same time, internation…