Both books are about female activists, one from the USA & the other from Kenya who loved trees, and from their efforts improved the environment.  Millions of trees exist today because of these women.

The Tree Lady: The True Story of How One Tree-Loving Woman Changed a City Forever by H. Joseph Hopkins (Author) Jill McElmurry (Illustrator) Published by Beach Lane Books Harry N. Abrams (2013) Age Range: 5-10 years

Seeds of Change: Planting a Path to Peach by Jen Cullerton Johnson (Author)  (Illustrator) Published by Lee & Low Books (2010) Age Range: 7 and up