Do they understand the science?

According to an article in the Mail

Supermarkets should put doors on all freezer units to cut down on energy waste, [Consumer Focus] the Government's customer body has said.

and

Sainsbury's said it is looking at the idea of putting doors on freezer and chiller cabinets.

However, today it is pledging to change the gas used to keep its fridges cool in a bid to cut energy use.

The company is pledging to switch to fridges to CO2 gas in all stores by 2030 and has earmarked the first 135 stores for conversion by 2014. This will cut energy by around a third

Mrs R is interested to know that

Chief executive, Justin King, said: 'Fridges are by far and away the biggest source of CO2 emissions in any supermarket through both the energy required to power them and the refrigerants themselves.

If all supermarkets in the UK switched to this sort of refrigeration, the reduction in CO2 emissions would amount to around 2m tonnes a year.'

So what are they going to do?

They're going to use all the nasty CO2 to make their freezers colder :-

The gases most commonly used in supermarket refrigeration are HFCs and HCFCs, also known as ‘F-gases’. Where F-gases have a Global Warming Potential (GWP) of 2,000-3,000, CO2 has a GWP of just 1 making it many times less ‘damaging’ in environmental terms.'

So, it would seem that according to Sainsbury's, government-run Consumer Focus and the Daily Mail, CO2 is not the worst bête noire, as AGW alarmists would have us believe.