It’s not carbon that’s bad for the environment, it’s some of the carbon-based chemicals such CO, CO2, hydrocarbons, etc. It just happens that many of them share carbon as a base element, so “carbon footprint” and similar are a way of grouping them together. Pure carbon is harmless*. It just sits there (unless it catches on fire).
Edit: *mostly* harmless.
Hope that answers your question.
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