I missed the actual day...April 22 was Earth Day...but you can observe this day everyday.
Books about the earth, ecology and the environment are in various places in the non- fiction section of the library depending on the emphasis of the book. Do a subject search in the online catalog for earth, ecology or environment to find books on this topic.
Another place to look is in the gardening section..635.9.
Nationwide Arbor Day is Friday, April 25. In Florida we observed Arbor Day, a day to plant a tree, in January.
As always, library staff will be happy to assist you.