What can be used to enhance environmental safety in hydraulic systems?

While implementing automatic shut-offs is indeed a valuable safety feature in hydraulic systems, the option that directly enhances environmental safety is utilizing biodegradable oils. Biodegradable oils are designed to break down more easily when spilled, minimizing environmental impact and reducing harm to soil and water systems.

Automatic shut-offs primarily focus on preventing leaks or overflows that could lead to spills. However, although they contribute to operational safety, they do not change the inherent environmental risks associated with using traditional hydraulic fluids that may be harmful or toxic when released into the environment.

By using biodegradable oils, a hydraulic system not only promotes safer handling but also ensures that any accidental releases will have a lesser long-term effect on the ecosystem. The other options mentioned either do not address environmental safety directly or could potentially compromise system performance or reliability.