The calculator uses an emission factor of 350 kg of CO2 equivalent per passenger-day. This is a high-level estimate of the emissions generated during a stay on a cruise ship. It is important to note that GHG emissions can vary considerably depending on the cruise company and the region of the world where the cruise is conducted. For example, some cruise companies have invested in cleaner technologies to reduce their emissions, while others continue to use more polluting fossil fuels. In addition, cruises visiting more remote destinations tend to have higher emissions due to the distance traveled. There are differences between studies addressing GHG emissions associated with cruises. However, it is clear that these emissions are significant and that it is important to take action to reduce and offset them.