It stresses how thoughtless it is to destroy redwood trees when they are so difficult to replace.
It supports the claim that redwood trees must be preserved, not destroyed.
Explanation:
These are the ideas that are conveyed in this passage. In this text, we learn a little about what the author believes is the situation of the redwoods. The author tells us that the redwoods cannot protect themselves, nor can they grow quickly enough to match how we cut them down. This is intended to show how thoughtless it is to cut them down. Moreover, it conveys the idea that the redwoods need to be protected, not destroyed.
