A marine biologist loves the water, loves the animals of the water, yet some must deal with the effects of people who don't love the water. It can certainly be frustrating when you put so much effort into a conservation project to find out that some business decision means you've got another potential crisis to reverse.
Stress is when you've spent years restoring marshland only to hear that City Council has approved the construction of a nuclear waste dump right next to your beloved lily pads.
Stress is when you discover that the federal bureaucrats have eliminated the entire budget for protecting endangered marine mammals.
Researchers are likely to get stressed when data is confusing or inconclusive. Professors get stressed right around the time they need to submit their research proposals to the big wigs who determine their research budget. And, those at marine-related organizations certainly stress over how to convince the public and lawmakers of the importance of conservation efforts.