The Watership Down rabbits removed an additional 0.1 nanometers constructing their warren, although that was mostly soil. British rabbits have historically mined very little coal; the sole rabbit-run coal plant was shut down in the 1990s.
https://explainxkcd.com/2992/
"the sole rabbit run coal operation was shut down in the '90s" LoL
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"the sole rabbit run coal operation was shut down in the '90s" LoL