http://gizmodo.com/5291538/romulan-planet-drill-now-in-testing-stages-for-real

Now, I've got a question.  If we drill down to magma, and use that
heat for power generation...   aren't all powerplants just heat pumps?
 we generate the power while letting heat flow naturally down the line
to colder climes.  which would be.....  the crust,the ground, the air?
 wouldn't that cause a global warming if done on a large scale as
well?

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