Geothermal Oasis Alternatives on Ice Planet

I have an Earth analog that is nearly completely covered in ice and glaciers. I want to have oases of warmth scattered across the planet. These oases aren't tropical by any means, having just enough heat to support soil temperatures warm enough to allow tree growth. However, geothermal heat often seems dangerous due to poisonous gas releases, sulfur compounds, and other dangers. Are there any other possible ways to warm these oases?

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Geothermal Oasis Alternatives on Ice Planet

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