Examines the widespread impact of various small-bore engine recreational machines, including snowmobiles, ATVs, and personal watercraft. The author explores the historical development and economic significance of these industries, noting the substantial revenue and employment they generate. However, a primary focus is on the environmental degradation caused by these machines, detailing their effects on ecosystems, wildlife, and natural landscapes, particularly in national parks and wilderness areas. The text also addresses the public health and safety concerns associated with their use, such as noise pollution, accidents, and injuries, while discussing the challenges and controversies surrounding federal and state regulation in the face of industry resistance and user advocacy for continued access.