Ideas to face planetary health challenges... What have we done wrong during the covid-19 pandemic and how should we organize ourselves to respond to the next emergency that threatens the health of humanity? Salvador Macip is convinced that we have the resources to do it, but they will only be useful if we know how to use them efficiently. Through a lucid analysis of the main social and scientific factors that have marked this crisis, and with the tools of the best scientific dissemination, the author offers us the keys to an increasingly necessary global paradigm shift.