It is Arbor Day today in much of the USA. Nebraska journalist Sterling Morton advocated tree planting to keep soil in place, act as windbreaks and provide fuel and building materials. In 1872 he promoted a tree planing holiday; in 1874 it was proclaimed by the Governor of Nebraska and Morton's birthday, April 22, was selected as the day of observance. Now it is celebrated in most states on the last Friday in April (it varies according to climate) and has pretty much been overshadowed by Earth Day, which has also co-opted the April 22 date. So go out and plant a tree and remember Sterling Morton's words:
Each generation takes the earth as trustees.
See also: Today is National Arbor Day!