The streets of Vancouver were filled with people eager to send a message to world leaders who have arrived in Paris.
Tomorrow kicks off the UN climate summit where countries are trying to agreee on national limits on future greenhouse gas emissions.
Climate-change activists held protests in many cities.
The local rally occurred in front of the Vancouver Art Gallery.
Afer hearing from speakers, demonstrators then started walking along West Georgia, Burrard, and other downtown streets.
Below, you can see how people described today's events over Twitter.