Which symbols indicate an environmental hazard?

The dead tree and fish symbol is specifically used to indicate an environmental hazard. This symbol represents substances that can negatively impact the environment, including aquatic life and ecosystems. It serves as a warning to users that the material could cause harm to the environment if not handled or disposed of properly.

The skull and crossbones symbol indicates toxicity and represents substances that can cause severe health risks or death upon exposure. The fire symbol is associated with flammability or explosive hazards, while the health hazard symbol denotes dangers related to health effects like respiratory issues or carcinogenic properties. These symbols serve different purposes and convey distinct risks, while the dead tree and fish symbol specifically addresses potential environmental damage.