If temperature on our planet rises by 4 degrees by year 2100, vast areas of London, New York, Bangkok, Mumbai, Bay Area and other major cities will likely be underwater by the end of the century, based on current climate trajectories that will cause massive sea level rise. As a result of rising water levels, coastlines will be significantly altered, and many cities will become uninhabitable, displacing more than 250mn people. Not only that storms and extreme climatic events will penetrate further into landmass, causing challenges at scale we have not seen before. Further extreme weather events like heatwaves will be more frequent and long-lasting, causing droughts, global food shortages, mass migration, and increased spread of infectious diseases as habitats and ecosystems gets disturbed. Planet scale intelligence getting built with LLMs and digital twins needs to be deployed to solve this global challenge in a real manner, not like the green washing that is the norm. It will take significant technology insight, collection of global data, talent applied at scale to move us towards a sustainable future.