How to create snowball Earth again?

NASA received a telegram from the direction of Proxima Centauri stating that the abominable snowman are coming for a visit and they expect snow to fall everywhere even along the equator. They also promised all out war if we didn't give them a snowball Earth and ETA is less than a century away! BTW according to a few of the defectors still hiding in the Himalayan region claims that the abominable snowman once drained the entire ocean from Mars and polluted the entire sky on Venus. (However they seems to put the blame on Bigfoot, another alien species for tilting Uranus.) How shall we plan to throw a year round x'mas party to welcome the yeti so as to protect the last hospitable place in the solar system? To ignore the warning is courting death!

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How to create snowball Earth again?

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