Various efforts are underway toward decarbonization all over the world and the Mitsubishi Heavy Industries Group (MHI Group) also made the declaration of achieving carbon neutrality by 2040. The MHI Group has defined two growth areas: "Energy Transition" on the supply side and "Smart Infrastructure" on the demand side to contribute toward achieving a carbon neutral society. This report introduces our decarbonization solutions starting from ports and describes the current status of activities.