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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.