While there is a threat of shipwrecks and oil spills that can cause serious damage to the water ecosystems, these things are not as common as CO2 emissions caused by air freight. As a result, cargo shipping through air leaves a much larger carbon footprint compared to cargo shipping by sea. The International Chamber of Shipping has found a vast gap between CO2 emissions on ocean shipping versus air freight. The Grams per tonne/km is multiple times higher in air freight compared to ocean freight. This undoubtedly leaves ocean freight more environment friendly.