Are Canadian environmentalists a terrorist threat?

I sure hope environmentalists are a "threat" to the current world order, although I wouldn't call it "terrorist" in the bomb throwing sense. Realistically, I would say environmentalists are currently more a nuisance than a real threat. It's a good sign that the government feels threatened, but the majority of people are still perfectly happy to drive around in their tar sands fueled SUV's.

From the Sierra Club:

In a report released yesterday outlining the federal government’s new counter-terrorism strategy, Public Safety Canada listed environmentalists among other “issue-based domestic extremists” that could pose a threat to Canadians.

Here's the relevant part of the report:

Such extremism tends to be based on grievances—real or perceived—revolving around the promotion of various causes such as animal rights, white supremacy, environmentalism and anti-capitalism.