The single biggest living organism on the planet is named for the man who torched Georgia. (Okay, details: that “biggest” depends on what you mean by “single,” “living”, and “organism.”) When I arrive at its foot, it is fairly mobbed by paparazzi. The “General Sherman” giant sequoia, a coniferous tree 274 feet tall and 102 feet in circumference at the base, is ringed by a paved trail and fenced off to protect its root system, according to Sequoia National…