Hang on, if they sequester 10 tons and you build 5000 of them you would sequester 50,000 tons per year, not nearly 25 billion. 10 tons is in the region of what

Hang on, if they sequester 10 tons and you build 5000 of them you would sequester 50,000 tons per year, not nearly 25 billion. 10 tons is in the region of what the global per capita emissions are so you're looking then at about 3+ billion needed.