SSEN are environmentally green?

SSEN use Gas insulated transformers in their substations the gas is sulphur hexafluoride (SF6). It is a man made gas, a greenhouse gas. Here is a snippet from the National Grid website …

‘SF6 is one of the most potent greenhouse gases we know. Its high atmospheric stability and ability to trap infrared radiation means it’s far more potent at warming the earth’s atmosphere than CO2 over longer periods of time.

In fact, it’s estimated that, over a 100-year period, SF6 is 23,500 times more effective at trapping infrared radiation than CO21, meaning that 1 kg of SF6 has the same impact as 23,500 kg of CO2. Once in the atmosphere, it has an atmospheric lifetime of 3,200 years, which means it can accumulate without degrading for millennia to come.’

On top of that is the tens of thousands of tons of concrete and steel required to deliver the pylons which they ssem so keen to inflict on the populace. Green? I think not!