Dark snow is a term used to describe snow that has lost its characteristic white color due to pollution. It is an alarming indication of the increasing levels of greenhouse gases in our atmosphere. However, there are various synonyms that can be used to describe this phenomenon. One of the most commonly used synonyms is "dirty snow," which highlights the contamination that has occurred. Other options include "gray snow" and "sooty snow," reflecting the presence of particulates in the air. Ultimately, whatever term is used, it is important to recognize that the appearance of dark snow is a clear reminder of the urgent need to reduce carbon emissions and protect the environment.