This is a CBC archives video of the blockade at Lyell Island. One of the main complaints of people opposing the blockade was that it would hurt logging; Haida worked in the logging industry, but many also relied on salmon fishing. The people who blockaded Lyell island believed that cutting the forests down would destroy the salmon spawning grounds and their fishing livelihood, something that is now substantiated by science. Today, Haida Gwaii and Gwaii Haanas park are a major tourist destination.
http://www.cbc.ca/archives/entry/loggers-confront-haida-blockade