It is easy to suggest to fly less but it is going to be impossible to convince society where core values include agressive "extra" consumption, which in turn is the backbone of the world's current economy. Flying is one of top "extra" consumption types out there. I know many people are trying to convince people of that, but the society is moving in the opposite direction - bigger cars (both us and eu), more travel. Maybe arguments used currently are not convincing enough? I mean, sure, keep trying and you will obviously reach a certain 0.00x% of the population, but that's not really going to make any difference