The author is trying to convey that in recent years, the extinction rate for many animal species has significantly increased. He began his point in the first sentence of the excerpt: “Species are disappearing at an accelerating rate through human action, primarily habitat destruction but also pollution and the introduction of exotic species into residual natural environments.” Then, he further emphasizes his point in the sentence: “As the last forests are felled in forest strongholds like the Philippines and Ecuador, the decline of species will accelerate even more.” Which is immediately followed by another sentence that supports his argument: “In the world as a whole, extinction rates are already hundreds or thousands of times higher than before the coming of man.