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 about the disappearing species, based on the excerpt, are that 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 extinction rates are already high. Additionally, the author emphasizes that the loss of species will result in the destruction of potential biological wealth and the loss of various products and amenities.
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