What is the author's tone in High Tide in Tucson: Essays from Now or Never by Barbara Kingsolver?

Kingsolver uses rhetorical tropes such as personification and metaphor that serve to impassion her writing. For example, she writes in one section that the trees "are beginning to shrug off winter" and refers to maple trees as dark and "leggy." Kingsolver draws a picture for the reader when she depicts the woods as as "shot through with beaming constellations of white dogwood blossoms." She speaks about the ground "yawning" to reveal an underground stream. Not only does the reader benefit from the richness of her descriptions and the strength of her literary abilities, the passion that she has for the subjects she writes about is made more apparent.