Welcome to the Semester in Environmental Science (SES). The program is offered each fall by The Ecosystems Center, Marine Biological Laboratory (MBL), located in Woods Hole, MA. SES is a 15-week program in environmental science offered to students enrolled in colleges participating in the MBL Consortium in Environmental Science. More than sixty colleges and universities have approved the SES for credit.  Students from non-affiliated colleges and universities may receive credit for the semester through Brown University.

It is no accident that the Marine Biological Laboratory (MBL) is located in Woods Hole on Cape Cod. To the north of the Cape, cold Gulf of Maine waters support fauna characteristic of the Boreal biogeographical province, while south of the Cape, warm Gulf Stream waters sustain fauna typical of the Virginian province. Situated at the boundary between these two biogeographic provinces, a great diversity of marine organisms are within easy access of the lab. Little wonder Woods Hole has become a mecca for marine and environmental sciences. In addition to the MBL, the National Marine Fisheries Service (NOAA/NMFS), the Woods Hole Oceanographic Institution (WHOI), the Sea Education Association (SEA), the U.S. Geological Survey and the Woods Hole Research Center all carry on active research programs in the Village of Woods Hole. Woods Hole is truly a world center for research on the environment and the world's oceans.

The MBL is the oldest private marine laboratory in North America, and has served as a home to researchers and students studying both basic biology and the environment for over 110 years. The noted author and scientist, Lewis Thomas, called the MBL "the National Biological Laboratory." Little wonder - since its founding in 1888, more than 49 Nobel Laureates have conducted research at the MBL. Today about 250 scientists, technicians, and support staff occupy the lab year round. In the summer, the lab swells to over a 1000 as students and investigators from over 400 educational and research institutions representing over 70 countries come to MBL for the summer season.

The MBL has a long tradition of teaching and education. Currently, the laboratory offers more than 15 advanced courses for graduate and post-doctoral students covering topics ranging from Analytical and Quantitative Light Microscopy to Workshops on Molecular Evolution. In conjunction with the Ecosystems Center, the largest year round program at the MBL, the lab added the Semester in Environmental Science to its roster of educational activities in 1997. Offered during the fall semester, the SES program is dedicated to providing undergraduates with an opportunity to learn about ecosystems and conduct environmental research with some of the top scientists in the field. 

The Ecosystems Center was founded at the MBL in 1975. It has grown to become the largest research group at the laboratory. The Center's mission is to investigate the structure and functioning of ecological systems, to study the response of these systems to changing environmental conditions, and to apply the resulting knowledge to help preserve and manage natural resources. The research interests and expertise of center scientists are not confined to studies of marine systems, but are divided about equally between fresh water environments, terrestrial environments and salt water ecosystems.

The Center's scientific staff of 12 principal investigators and about 40 post-doctoral and technical support personnel have complementary skills in biogeochemistry, plant ecology, soils, environmental chemistry, animal ecology, marine biology, and oceanography that facilitate collaboration on a broad range of research. For example, research at the center presently includes studies on the effects of soil warming on forest ecology and mineral cycling, the ecological impacts of acid deposition, the long term dynamics of tundra, lake and stream ecosystems on the north slope of Alaska, the consequences of changing land use in watersheds of estuaries on organic matter export to the coastal zone, and the effects of deforestation in the Amazon Basin. Virtually all the principal investigators and many of the support staff participate in the SES program.