A. In 1978, I went to Hawaii, supposedly a tropical paradise. I am an enthusiastic birder, and I looked forward to getting into the lush forest to view the abundant flora and fauna the islands were famous for. Here you had this rich island chain, out in the midst of the Pacific, full of wondrous birds and plants — a place supposedly richer in natural diversity than even the Galápagos.

I had brought with me field guides to the fauna and flora, all published in the early 1970s. Yet once in the Hawaiian forest, I had a shock: my books were listing species that were extinct — or about to become so. I was in the forest six days a week and I kept thinking, “If I give it enough time, I’ll certainly see most of the species still left.” But I saw very little. In fact, in Hawaii today, I’d say there are only about 10 remaining native land bird species, with another 10 clinging to survival.

So suddenly this extinction business seemed very real. Whenever you’d meet biologists over coffee, th