European green infrastructure is a network of spaces (like parks, forests, and greenways) that help people and nature. These spaces provide habitat for wildlife, places for people to relax and enjoy nature, and can even help to improve air and water quality. Green infrastructure also helps keep cities cool, reduces flooding, and can even help reduce water bills by managing stormwater. It's basically like a big, green blanket of parks, forests, and greenways that help both people and the environment.