There's a guy in PA whose lifetime goal has been to plant 10 MILLION trees. And not tree plantations, a wide variety of Pennsylvania-appropriate trees and shrubs in yards, on farms, and in places we clear of invasive undergrowth (eg privet).
Obviously he doesn't do this on his own but rather through a large group of folks over time, although "Greg's sweat equity" is certainly a big part of it.
He emailed today to say he's got 200 to go and would I like to come to the work party on Friday.