Welcome to the Green Letters blog

Green Letters started as a simple idea: use satellites to notice when green space in a city shrinks or grows, then write people a letter about it.

This site already lets you subscribe by city. The blog is where we share the longer story around that work.

What you will find here

• Development — how we build the pipeline, what fails, what we learn.
• Urban greenery — commentary and news about canopy, parks, and nature in cities.
• Field journeys — visits to places the satellites flag as changing, so maps meet sidewalks.

If you care about the greenery you can walk to, subscribe for your city and check back here when you want the footnotes.