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Consider the earth as an orange. Global warming is like barely touching its surface, and geothermic power is like barely scratching its surface.

Global warming happens because CO2 magnifies our energy input by orders of magnitude. The temperature change caused by the actual energy we use is completely negligible. The part that counts involves magnifying the sun’s influence.

There’s no equivalent to that for geothermal power. The energy you extract is the energy that’s lost, and that’s it.

Think of the Earth as an M&M the size of a apple. All of the "environment" is the candy shell. The chocolate is the hot part.