"Now I know why Ryanair load factors are high....but don't you feel just slightly guilty, planet saving wise??"
Not in the slightest. I can drive but don't have a car, and car emissions is collectively far worse than plane emissions. I bet the vast majority of the silly environmental protestors that were at LHR drove to and from there; after all, how could they have brought their kitchen sinks with them? And when the 1p all-in deal comes again, I'll book more.