We can heat water to boiling point, yet the oceans aren’t vaporizing
on the same way, we can heat plasma by millions of degrees, yet we are not setting the world on fire, indeed by being so tenuous and such small quantity the plasma we heat would be harmless if it escaped
so basically you can use a minimum amount of energy to concentrate into very high temperature
the total amount of energy matters, the sun generates a huge amount of energy and if we did generate such amount of energy on earth we would be a star
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