B-The author contrasts the amounts and locations of the tree cover in the past with the amounts and locations of present tree cover.
C-The author discusses causes of damage to forests done from the time of the first European settlers forward to today.
Explanation:
In this text, the author urges the reader to realize that the natural beauty of the nation is not immutable. Far from being permanent, this can change due to human action, and thus should be protected. The author tells us that from the time that European colonists arrived in America to the present, human action has been responsible for significant damage to forests. He also provides evidence of such changes by contrasting the amounts and locations of tree cover in the past and present.
