More Correspondence from Bill

B: "We use a Dell computer which is fine except we are told it is not the most economical energy-wise. However we have bought an 'Eco-button' so that if we are on something but have to leave it, we can push the eco-button, go away and do our thing, come back and when we are ready to start again we push one board key and it returns us to what we were on. Each time we come back on it shows the Co2 we have saved, and the money so far (since we have been doing it). So far we have saved over £27 since we started - just thought it worth a mention as this technology must be available throughout the 1st world".

J: That is amazing; I will google around to see whether I can find more about it

B: In Youlgrave, Derbyshire, they have some sort of Hydro plant that harness the river water to create power for that local hamlet of houses; and you remember where we walked down into the Torrs in New Mills, which you liked, and I got booked for over-staying in the parking space, well, they have installed what they call an "Archimedes Screw" whatever that is - it looks like a metal spiral contraption that somehow taps into the current of the flowing river water and creates power for local purposes.

J: I think that is called 'run of river' power. It may come in other forms too.