Can Luxury Be Low-Carbon?

In Brazil, one architect tests the limits in a 7,500-square-foot home built almost entirely from stone, wood and ingenuity

- BY FRED A. BERNSTEIN

BY THE TIME HE WAS 50, Walter Cain had made enough money as a partner in a private-equity firm to retire and, he says, "do something creative for the rest of my life." Meanwhile, restoring and enlarging an 1837 Greek revival house in Piermont, N.Y