On Halloween, Seattle volunteers will replant a pocket forest that salmon still call home

Longfellow Creek is one of only two streams in Seattle where salmon still spawn — and on Halloween, volunteers will gather in the little 29th Avenue pocket forest on its banks to plant native trees, clear invasive blackberry and tidy the water's edge. The work is part of the Green Seattle Partnership, recently named a World Restoration Flagship by the UN Environment Programme and the Food and Agriculture Organization — one of the world's model ecosystem-restoration efforts. No experience is needed; tools, gloves and training are provided. Costumes, one suspects, are welcome.

SDG 15 · Life on land — Mechanism: community action