In honor of the United Nations' decision to declare 2001 "The International Year of Volunteers," our last column devoted itself to an utterly shameless advertisement for the book "Kokusai Volunteer Guide: Inside International Voluntary Work," published by The Japan Times and written by Midori Paxton.

In case you missed the last column, the book describes over 300 organizations that accept volunteers in fields ranging from famine-relief to the excavation of Aztec pueblos.

This being a Nature Travel column, last week we profiled volunteer opportunities related to the marine environment. Today, we turn our gaze to a few terrestrial opportunities.