On April 9 a post on Twitter/X announced:

Evergreen Action was founded on the belief that people are at the heart of our clean energy future. Simply put, staying true to the values we champion as an organization MEANS coming together to organize a union.

In record-breaking time, within an hour of the announcement Evergreen Action agreed to recognize the Evergreen Action Union.

Evergreen Action joins other environmental groups that have unionized in recent years, including the Natural Resources Defense Council, 350.org, Defenders of Wildlife, the National Audubon Society, the Sierra Club, and the Labor Network for Sustainability.

To follow their efforts: https://twitter.com/union_evergreen