What is the main conflict in Eva by Peter Dickinson?

The relationship between humanity and nature is the book's primary thematic consideration. The majority of the action is defined, either directly or indirectly, by the tension between humanity and the natural world or, rather, between MANIFESTATIONS of humanity and the natural world. Negative manifestations of humanity include insensitive and/or destructive curiosity, callousness, selfishness, exploitative-ness, and short sightedness, all of which come into conflict with the drive of nature simply to survive.