Prerequisites: declared major in Earth and environmental sciences and the departments permission. Students with particular interest in one of the many components of the Earth and environmental sciences should approach a director of undergraduate studies during the registration period so that tutorial-level exposure to the subject can be arranged. Each point requires two hours each week of readings, discussion, and research work under the close supervision of a member of the Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, American Museum of Natural History, or Goddard Institute for Space Studies. In consultation with the supervisor, the student selects a topic for intensive study and the time and place of the tutorial discussion sessions. May be repeated for credit up to a maximum of 12 points, with a maximum of 6 points with each staff member.