What are the best tactical urbanism projects to make a city more resilient to extreme climate?

Tactical urbanism often focuses on making cities safer for pedestrians and cyclists or more visually appealing, but for this post I’m curious about projects aimed at increasing climate resilience.

Have you seen examples like sustainable stormwater management, reducing urban heat islands, or mitigating all the other consequence we should expect. To give you context I'm currently living near Milan, Italy.

I’d love to hear about ideas, big or small, that have worked or that you’d like to see in your city!