Answer : 4. "Ministry of Ports, Shipping and Waterways"
Explanation :

Ministry of Ports, Shipping and Waterways launches “Haritsagar” Green Port Guidelines to reduce carbon intensity at all major ports. Under these guidelines, various green interventions such as ship-to-shore power supply, electrification of port equipment, use of alternative fuels like green hydrogen/green ammonia/manol in port ships and green hydrogen/green ammonia refueling, etc. Increase in renewable energy etc. has been made available.