Hidden Cost of "Low Price" airlines

So the beeb again reported yesterday that cheap airlines mean that the UK is becoming "air dependent" and, because of this, the cut in carbon dioxide emissions that the government is aiming for (60% by 2050) will never happen.

However, we were looking for flights yesterday.
You see, we've been given the opportunity of "platinum baby sitting" by the in-laws, meaning we can get a long weekend away (a second honeymoon, if you like) and so have been looking at a cheap city break.
What's the cheapest do you think?
A train ride to London or Edinburgh?
Surely this "Green" alternative to air travel?

Hell no, with Jet2 offering flights of £9 each outbound and £4 return, we're off to Amsterdam for the weekend..

You can see, therefore, why people might just not give a stuff about CO2 emissions when the more green alternative would cost at least twenty times that amount to a our capital city, never mind one in another country..

I'm not entering the debate, just making an observation..