Some environmental activists will stage a sit-in at Thunder Bay city hall this afternoon to protest against the removal of a stand of tamarack trees near Mohawk Crescent.

Rally organizer Christy Radbourne said her 13-year-old daughter came up with the idea.

"We were talking about the trees being removed a couple weeks ago at the dinner table, and she said, 'Well, why can't we stop it?' And I helped her along, saying, 'You know what, city council hall, that's where the city council [meets] ... and you could start there.'"

Radbourne said she expects about 50 people to attend today's sit-in, which is expected to start at 5 p.m.

The demonstration is about more than trees, she added.

"Removing something for aesthetic purposes, and replacing it with something that's deemed more pleasing, really sends a message to our community that — if we find something difficult or diverse or unwanted or different — we can exclude it,” she said.