The best answer for this question would be:
2. Cosmic Background Radiation
The Cosmic Background Radiation are when the heat of a planet is measured by the left over heat of it. This is based on the “Big bang Theory” wherein the planets were formed because it was once a very hot radiation.
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I'm assuming you meant subsistence farming? If so then yes, it would be a large problem because they would then not have enough food to feed themselves.
