1. footprint
Tom believes he has a very low carbon footprint.
All visitors leave a footprint
We left footprints in the snow when we walked across the garden.
I took a photo of this strange footprints.
His carbon footprint is huge – he’s always flying.
There's only one creature capable of leaving a footprint that size.
Judging by the size of this footprint, I'd say the perp is about six feet tall.