Dr Etherington's book explains, at the technical level, what many people know at the level of common sense - that wind power can't possibly save significant levels of CO2, that wind cannot produce reliable base load energy and that wind power is hugely expensive compared with other main forms of energy production. For arguments sake, lets suppose a fleet of wind farms can produce between 10GW (when wind is blowing at its optimum speed) and 0GW of electricity (when the wind is not blowing much at all) - where is the shortfall of electricity going to come from? You've got it, it has to come from dependable power stations which can be cranked up quickly to fill the gap, and the only power stations that can do that are fosil fuel ones. But hang on, what happens to their output when the wind farms are producing their maximum 10 GW? If you down scale the fosil fuel (best being gas) generators which have been built as dedicated back up for wind, then not only are they going to be run incredibly inefficiently, but they are going to operate at a whacking great loss - unless of course they are heavily subsidised by the general public, just like wind farms.
The bottom line is that for every GW of wind energy generated we have to duplicate that investment by building dedicated back up fosil fuel generators which will be run very inefficiently because of the need to constantly ramp them up and down in order to fill the wind energy gap. This will inevitably lead to near zero saving in CO2 emissions and a cost of electricity (remember to add on the billions of pounds required to upgrade the electricity distribution system) which will force millions in the UK into fuel poverty.
If you have swallowed the wind industry and political propoganda that wind energy is the answer to our energy and CO2 problems, then read Dr Etherington's book which I am sure will change your mind.