Final answer:
The author believes that the loss of plant species and habitats will devastate animals and hinder human progress.
Step-by-step explanation:
The author's beliefs, as stated in the excerpt, can be summarized as follows: the loss of plant species and habitats will devastate animals and hinder human progress. The author mentions that the decline of species will accelerate as forests are destroyed, and they emphasize the importance of saving species by pointing out the potential loss of scientific information, biological wealth, and various products and amenities.
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