The world of the future

I think that my inner child would imagine a world of the future with all white buildings and mega-structures, as if it were porcelain. Marine megacities that do not contaminate the planet and with very sophisticated water and air purification systems. We would be located in strategic points of the planets where the earthquakes were very imporbable and the floods impossible. each megacity would have everything necessary for the life of the human being of the future, food, leisure, transportation, communications, etc. and in each of them there would be a specialization, such as science, medicine or biology. I imagine those giant pipes that connect the water of the earth with the megacities as a treatment plant and colossal filters making possible the emission of waste and CO2 at 0%. All the islands would be connected to each other by means of flying vehicles prepared for the atmosphere or teleportation in case of the most privileged classes.