Huh?
A modest 100 trees per acre in America’s 700+ million acres of forest is what? - 70 billion trees? Whew! That’s a lot of trees!
I was gonna guess a trillion then figured that would be too high. 10 - 100 billion was a lowball guess on my part. At first I was surprised by the 600 million figure for Alaska, but after thinking about it, even though Alaska is really, really big, huge amounts of it are mountainous and have few trees.