Type 0

A Type 0 or K0 civilization extracts its energy, information and raw-materials initially from crude organic-based sources (i.e. food/wood/fossil fuel); pressures via natural disasters, resource exhaustion, and societal collapse create extreme (99.9%) risk of extinction. Goes through agricultural and industrial revolutions and is eventually capable of advanced computing and orbital spaceflight. 21st-Century Earth is a Type 0 civilization.