As the earth spins through space, a view from above the North Pole would encompass most of the wealth of the world - most of its food, productive machines, doctors, engineers and teachers. A view from the opposite pole would encompass most of the world's poor.

After all, despite the economic advantage to firms that employed child labor, it was in the social interest, as a national policy, to abolish it - removing that advantage for all firms.

In certain ways, I'm not very different than I was when I was a teenager.

Environmental concern is now firmly embedded in public life: in education, medicine and law; in journalism, literature and art.