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Happy Arbor Day (or why Earth Day is April 22)
To those of us who grew up in Nebraska, the first Earth Day in 1970 was –yawn- no big deal. We had been observing Arbor Day since 1872. The founder was J. Sterling Morton, a Nebraska pioneer, journalist and Secretary of the Nebraska Territory who urged the planting of trees on the formerly treeless prairies. His original date was April 10, but it was changed to his birthday, April 22, in 1882.
http://earthsky.org/earth/this-date-in-science-why-celebrate-earth-day-on-april-22
His home in Nebraska City is now Arbor Lodge State Historical Park and Arboretum.