For marine ecosystem changes, we have usually considered the direct effects of human activities such as pollution hitherto. However, there may be some indirect marine ecosystem changes due to human activities through changes in the ocean induced by global warming. In fact, there are some papers reporting the marine ecosystem changes in the polar regions being most vulnerable to the effects of global warming. It is not yet known, however, if these changes are only temporary or not. This article presents a way to get firm evidence on the question how the marine ecosystem of Antarctic region has been changed including mechanisms and extents of the changes.

Island eco-tourism has lately received much attention. If while protecting an island's natural environment, it could also be used in an educational way as a tourism resource, the result would be a revitalization of the economy and thus the island itself. There are of course difficulties to be faced, but many attempts in various locations are now being made to establish sustainable practices regarding both the effects eco-tourism might have on the natural environment and local society as well as profitability of the project.

Recognizing the differences between true Ocean SF and similar genres and establishing their definitions provides new ways to enjoy both. In this article I also explore some of the restrictions unique to Ocean SF and introduce works that operate most ingeniously within these boundaries.