[throwthrow4567]

good sentiment, but how did you reach that remote island? most likely, that 2 hour walk produced quiet a hefty amount of disproportionate pollution.

[badcppdev]

I was going to say the same. There is a chance that they sailed to the location.

However a 6 hour flight from the closest major city would have given off 1500 kg of CO2 (per passenger). And presumably another 1500kg to get back again.