What might be a plausible explanation for the drastic lowering of global temperatures?

Question: What circumstances (theoretical or based on actual past events) could lower the global temperature on Earth or an Earth-like planet to an average of 30℉–40℉ (-1℃–4℃)?

Conditions:

• Both natrual and man-made solutions are acceptable.
• The cooling transition may take up to 2,000 years.
• The "ice age" or final cooled condition would last 500–700 years.

The best answer:

• Uses the least amount of magic.
• Causes the least amount of damage to current life on Earth.

I understand that some extinction or endangerment is inevitable.

posted over 6 years ago

SavageCaptain‭

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