In a brilliant work of imaginative non-fiction, prize-winning author J.B. MacKinnon asks what would happen--to our economy, our ecology, our products, our selves--if we stopped consuming so much? Is that alternative world one we might actually want to live in?"We can't stop shopping. And yet we must. This is the consumer dilemma."     The planet says we consume too much: in North America, we burn the earth's resources at a rate five times faster than they can regenerate. And