GPON FTTH greener than DSL

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This interesting post from the Techslpoder blog indicates that FTTH using GPON (Gigabit Passive Optical Network) technology is substantially better in terms of carbon emissions than current ADSL or VDSL.

Although the article is not as clear or comprehensive as it might be, it also appears that the Active Ethernet option for FTTH, which offers significantly better performance for the end user, but which requires powered switching in the street cabinet, uses more energy and therefore creates more carbon emissions that DSL. This of course assumes that the required power is generated from conventional fossil fuel sources. If solar, wind, or hydro generated power were used as a source then presumably the carbon emissions would drop right back.

The article does not cover the option of running direct fibres straight from the central office right to the home avoiding any sort of splitting or switching at the cabinet, as used in the often-cited Nuenen cooperatively owned network in Holland. So another argument, if it were needed, in favour of FTTH over DSL. However the use of renewable energy for any major ICT project must surely be an obvious feature for any community planning its own fibre roll-out, thereby further reducing carbon emissions.