Explain what carbon footprint is in one sentence.
A carbon footprint is the total amount of greenhouse gas emissions, including carbon dioxide, primarily caused by human activities, that an individual or organization produces, directly or indirectly, expressed as a carbon dioxide equivalent.
Complete the following task based on the instruction and optional input provided.### Instruction:
Explain what carbon footprint is in one sentence.

### Output:
A carbon footprint is the total amount of greenhouse gas emissions, including carbon dioxide, primarily caused by human activities, that an individual or organization produces, directly or indirectly, expressed as a carbon dioxide equivalent.