Two letters referred to a visit by councillors to see Al Gore's film An Inconvenient Truth (Gazette, December 7 and 14).

Is it not also an inconvenient truth that the Renewable Obligation Certificates (ROCs) have never been fully explained to the public, who pay for them?

The government is set to impose various green taxes yet we all already pay this 'hidden subsidy' for renewables, on our electricity bills.

Two wind farms in Tony Blair's constituency 'consented' Walkway and Butterwick which is in 'consultation' could provide the operators of each wind farm with about £3m a year for 25 years. Yet all we hear is that the community will receive about £21,000 a year from Walkway and about £25,000 a year from Butterwick!

Devised by an Einstein of the financial world. Who else could devise a subsidy which can masquerade as a levy? The ROC system is the epitome of an inconvenient truth. Without this hidden subsidy would anyone be building wind power stations?

Reducing carbon dioxide emissions and other pollutants seem lost in the race to meet and even surpass regional targets, mainly for onshore wind. A real catch 22 as until wind turbines are built, we cannot prove whether wind turbines are reducing CO2 emissions as expected. They are certainly not in the North East of England!