[echoangle]

The 200kg of emissions aren't from the crossing though, they are there anyways. You would have to calculate the additional emissions from the physical exercise in the crossing.

[throw83939449]

Why not? We already calculate cow farts! And kill animals because they breathe to much!

Human is the engine here!

Take old galleys where hundred people rowed single boat. All that food to feed them! That is not very effient transport!