is it OK for boats to sail on the sea

Question: is it OK for boats to sail on the sea
- Keywords:
  earth,
  environment,
  ocean,
  travel
Asked by DAN to Colin on 10 Nov 2014.
- Colin Johnston answered on 10 Nov 2014:
  
  Hmm, yes, humans have been sailing boats and rafts for at least 10 thousand years (and probably much longer) so I think the concept has been proven.

Question: is it OK for boats to sail on the sea