Ships that adopt various technologies to reduce atmospheric emissions, reduce fuel consumption and reduce the output of harmful substances to the environment to meet the requirements of sustainable development are green ships. For example:

1. Green emissions: such as liquefied petroleum gas engine, sail propulsion, solar electric propulsion, nuclear reactor propulsion, PEMFC proton exchange membrane fuel cell propulsion, etc. These propulsion devices are characterized by no or little emission of carbon dioxide and other sulfur, and no environmental pollution;

2. Environmental adaptability/friendly green: LPG, solar energy, windsurfing and fuel cells will be promoted to be greener if heavy metals, nuclear waste and harmful compounds that are harmful or degraded to the environment are not produced.