Any of you that want to know where your business stands should contact
www.carbontrust.co.uk . It's one of those simple truths that saving the planet usually means saving money as well.
With respect to a helicopter's Carbon Footprint - sadly those donkeys know how to drink!
For every 1,000 litres of Kerosene you put in you will produce 2.52 tonnes of CO2 - enough said
(see
http://www.resurgence.org/carboncalculator/ for a nice, simple tool which covers many fuels).
... as Cyclic said back on the 1st ...
Better get planting some trees there boys!