Web_climate-changeRe: Bernie McComb (Sentinel-Times, August 20): The alarmist position is that man-made CO2 is heating up the earth and producing dangerous climate change. Science is about dealing with measureable (empirical) data. The world’s land-based temperatures are collated by the British Met Bureau and the current published figures in the ‘UK Mail’, December 28, 2012, showed that for the last 17 years the temperature was 14C with a variation of plus or minus half a degree.

The chief scientist of the IPCC Dr R Pachauri when in Melbourne said the same thing (Australian February 22, 1913). A temperature record of 30 years is required to establish a genuine trend. On August 24, 2013, the ‘Tree Hugger’ site reported that the concentration of CO2 in the atmosphere had reached 400ppm. An exercise in clear thinking would suggest that if the amount of CO2 has increased and the temperatures have not increased, the “consensus” of the alarmists needs re-examining.

The Chief of the Met Bureau Prof Phil Jones admitted that the climate models were imperfect: “We don’t fully understand how to input things like changes in the oceans, and because we don’t fully understand it you could say that natural variability is now working to suppress the warming. We don’t know what natural variability is doing.” Mr McComb is speculating on future costs. I would like to see an audit of the present costs of the “climate change” programs we are paying for now. I was phoned twice in 10 minutes last week with offers to install the gadget that reduces the use of standby power. I had this gadget installed two years ago. Another time I was offered a later model of this gadget which used less standby power. I thought that was taking “planned obsolescence” a bit too far.

DJ Auchterlonie, Trafalgar.