Excellent. Thank you for the belay. Yes, that should have been "million trees" (order 1 tree/m^2 for pine forest; though orchard is order 0.1), and "a person'

Excellent. Thank you for the belay. Yes, that should have been "million trees" (order 1 tree/m^2 for pine forest; though orchard is order 0.1), and "a person's life" respectively. Meta: failure mode on both was switching/editing between several candidate examples in place, and not checking that the final edit was consistent. Including a sketch of the calculation is one way to make this less likely.