What is the fine-grained topic of the following text: Designed to test the effects of multiple anthropogenic stressors on the marine environment, such as temperature, nutrients, CO2, and low O2, the facility includes two environmental chambers with flow-through seawater, a CO2 exposure facility, and an inverted microscope equipped with DIC optics, epifluoresence, and CellSens imaging software. Only return the topic.
Testing the effects of anthropogenic stressors on the marine environment