If Earth's atmosphere were to be enclosed, what effects would what have?

A universe-destroying parasite is set loose, and basically earth is placed under magical quarantine. (Think of it like the world is wrapped in magical cellophane.) My question is, how would earth's environment change, if at all, if the atmosphere is completely closed off from space? Would it affect pollution levels? Climate change? Plant Growth? If this does affect life, how long until the earth is no longer habitable?

Here's some more info: The forcefield is clear, so light can pass through it, though nothing else. It might absorb some heat energy, though, but not catastrophically. No substance can leave or enter through the field, not even on a molecular level.

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If Earth's atmosphere were to be enclosed, what effects would what have?

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