You may have seen the adverts in the UK for Virgin trains 'Pendolino' train which uses bio fuel and is environmentally efficient.
Sounds like a good idea to me, but I imagine the chances of getting a couple of hundred thousands pounds of biofuel from Virgins' destinations in the US or China might be an interesting logistical challenge.
It's also particularly interesting considering that the general school of thought in the aviation industry is that some airline is going to start to 'unbundle' the cost of fuel from an airline ticket and charge it separately. This does, of course, raise the question of exactly what are we paying for in an airline ticket if not the cost of the fuel. Will this lead to transatlantic tickets being a couple of Pounds Sterling but with a £10 security charge, a £30 admin fee and a £400 fuel surcharge ...?
Keep your eye out on this one.