In reply to wintertree:
My quick trawl of internet suggests to me
The production of 1 tonne cement generates about 1 tonne of CO2
Grid electric generated 1/2kg CO2 per KWH so 2000KWH (or 2MWH) = 1 tonne concrete
The scheme is flagged to produce 350MWH per year equivalent to 150 tonnes + of cement
My generous guestimate is that the scheme will require significantly less than 10 tonnes cement
My calculations suggest to me that the problems with CO2 and cement is not a significant issue here
Rotting vegetation – there is no dam just a weir, very little ponding for decay to occur (and scoured by mega tonnes of water)
China , grand spot but not in Langdale, i will leave their struggle with CO2 to others