How is Skype (for example) more eco-friendly than fixed land lines?

My significant other

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    Landlines actually consume less power than computers. When fully on and in use, desktop computers consume about 150 watts of power. Laptops use a significantly smaller amount of energy–15-40 watts, depending on the type of computer.

    But the most eco-friendly way to communicate would be the use of a mobile phone, which operates on battery power (but mobile phone chargers use about 10-20 watts). A landline uses 10 watts of power.

    So, in terms of energy usage, fixed landlines could be considered more eco-friendly because they consume less power than a laptop or desktop computer that would be used to access Skype.

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