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Aggregating Energy Since 2006

Opportunity to win $25 million

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For you inventors out there, billionaire Virgin head honcho Sir Richard Branson has offered $25 million to the first person who can design a CO2 eating machine that can remove at least a billion tons of CO2 from the atmosphere. Branson made the announcement with Al Gore at his side. This hypothetical machine would differ from standard carbon capture and sequestration (CCS) because rather than capturing the CO2 at the source, it would remove it from the ambient air.

I'm offering my own contest with a $0 cash prize to the first person who can calculate the number of trees that would have to be planted to remove one billion tons of CO2 from the atmosphere. Bonus question: how much land would these trees take up?