"The extremist fringe of each movement has published some form of handbook or provides Internet instructions on how to engage in mischief, civil disobedience, vandalism, and sabotage-ecotage as it is known in Enviro-speak. Some of the suggestions are extremely dangerous, among them potentially lethal methods of tree-spiking which have caused serious injuries. The instructions, often resembling those found in The Anarchist's Cookbook, include bomb-making details. Though the level and scale of single issue-driven terrorism have moderated somewhat over the past two years, certainly in comparison with the turbulent days of the 1980s and early 1990s, the threat has not lessened. Extremist incidents continue to occur, especially associated with animal rights and environmentalism in England and Canada. Currently, abortion remains a volatile issue in the United States, where the first fatal bombing at an abortion clinic occurred on 29 January 1998 in Birmingham, Alabama. The USA has already registered five murders tied to the abortion issue. In Canada, abortion activists are using the tenth anniversary of the Supreme Court decision lifting Canada's legal restrictions on the practice to focus popular and legislative attention on what is seen as flagging enthusiasm for abortion within the medical profession, although in fact the number of abortions has increased significantly in the past ten years."