Carbon dioxide storage in bioproducts are one of the ways how to reduce climate change, GHG (greenhouse gas) emissions and fossil resource usage. To move towards to climate change mitigation there are necessity for methodology where are calculated carbon dioxide capacity in bioproduct. Methodology consists of five modules where (1) need to estimate bioresource quality, (2) need to calculate stored CO2 emissions in bioproduct, (3) need to evaluate bioproduct eco-design, (4) need to calculate in product production emitted CO2 emissions and (5) need to calculate total CO2 emissions. Using this methodology for lyocell the balance between stored and in the product production emitted CO2 emissions are 0.04 tCO2/tlyocell, where this product gives positive impact on environment.