The Zero-Garbage Mumbai Action Plan by Hansel D'Souza aims to establish a long-term solution for waste management in Mumbai, which produces 7200 tons of garbage daily. The plan includes enforcing segregation of waste, implementing a structured collection system, and promoting composting at institutional and community levels. Key strategies involve creating composting sites, recycling dry waste, and incentivizing composting to mitigate the environmental impact and improve public health.