The correct answer is - b. The effects of rising ocean levels on marine ecosystems.
The effects of the rising ocean levels on the marine ecosystems is a study that includes the whole world, thus it is a large scale study.
The global warming is becoming an ever growing problem, as the ice caps are melting more and more, and the ocean levels are constantly on the rise. Despite the rise of the ocean levels being slow, and only manifested in mm on an annual level, on the long run it can be devastating.
The marine ecosystems are heavily affected by this, as their environment changes, the temperature of the water changes, the nutrients are more abundant at some places, while much less on others. That all manages to result in the decline of lot of the species in the marine ecosystems, as they do not have enough time to adapt to the quick changes.
