A structural engineer in London has found a new way—and a new place—to create living habitat for wildlife in the heart of the city: right up the wall of buildings.

Alistair Law’s “Vertical Meadows” grow a biodiverse array of native plants on the face of buildings and construction sites, and help provide critical waystations for wildlife through one of the planet’s biggest cities.

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Whether you’re in an urban or rural area, you can monitor the health of the environment around you through these featured citizen science projects.