How We Calculate

Emission calculation GreenSea has, together with Tricorona developed methods to conveniently calculate and neutralise the emissions from a Sea Transport. All calculations are based on the work of NTM (Network for Transport and the Environment), but with comprehensive input of ship and/or voyage distance data. GreenSea aim to develop calculators for all lines of Sea Transport business. Climate impact calculation The climate impact of emissions is a complex subject. Here are some of the main factors involved. Different gases have different "radiative forcing" factors (i.e. the extent to which a given amount of the gas affects atmospheric temperature). For example, methane is deemed to have about 21 times the radiative forcing of carbon dioxide. Radiative forcing factors can also be affected by altitude. Some gases have a direct warming effect, such as carbon dioxide, while others have an indirect effect due to their impact on atmospheric chemistry. Different gases have different lifetimes in the atmosphere. Moreover, the lifetime of a given gas varies with altitude. For example, stratospheric carbon dioxide lasts for a few years, while methane lasts for 10-15 years. For SeaTransportation direct carbon dioxide emissions constitute the vast majority of the total climate impact, and we have accordingly restricted our calculations to direct carbon dioxide emissions from fuel usage.