This is my Inaugural Lecture about the Blue Revolution. It shows that we need to ralize urban expansions on the water and combine this with floating food production and floating algae biofuel production to deal with the challenges of the 21st century. Much of the work was developed with my colleagues at DeltaSync. We want to collaborate with people all over the world to develop pilot projects and expand on the water in a sustainable way. it goes much further than being self-sufficient. The purpose is to create a symbiosis between cities on land and water. Floating cities could use the waste CO2 and nutrients of land based cities in a productive way, providing at the same time affordable flood proof housing for the people. Most of the building blocks are there. We need to bring it together to make the next step. Because only a small part of the ocean is needed, the rest can become a nature reserve giving marine ecosystems a long term perspective on survival. A perspective that is currently lacking. We look forward to receive comments and ideas. Best regards, Rutger de Graaf