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Kraemer, Baerbel.  "Reducing the Environmental Impacts of Cruise Ships in the Arctic and Antarctic," Industry and Environment, 2001, 24:3-4 (July-December), 37

Cruise ships that travel to the highly sensitive ecosystems of the
Arctic and Antarctic can have significant environmental impact. The UNEP/UNESCO?World Tourism Organization Tour Operators Initiative for Sustainable Tourism Development (TOI) industry members are committed to reducing the impact of tourism on these sensitive landscapes. Hapag-Lloyd Kreuzfahrten (HLK) addresses this issue by employing appropriate technology on its ships, including biological sewage plants, waste incineration or port discharge, and thick-hulled construction. Ship paint is free from highly toxic organotin compounds. Tour guides are trained in all aspects of the culture and environment of the destination.