The Burtynsky DVD is excellent. I think his message is that preservation alone will not reduce the human impact on the landscape. We need to think about our waste. To me, digital cameras are bad because they are not upgradeable in their present configuration. They are no better than laptops, cell phones and other throw away items. Intentionally poor design by short-sighted manufacturers; but the ultimate culprit is the consumer (including those amongst us who adopt digital photography).