The International Maritime Organization's 2023 Greenhouse Gas Strategy commits global shipping to net zero emissions by or around 2050. Indicative checkpoints target reductions of twenty to thirty percent by 2030 & seventy to eighty percent by 2040, compared to 2008 levels. The Carbon Intensity Indicator rates vessels from A to E based on carbon efficiency, driving investment in cleaner operations. A structured Marine Environment Protection Committee legislative timeline runs to 2028, when a revised strategy is due for adoption.