For years, I have admired and listened to the wisdom of Dr. Sylvia Earle, a world-renowned marine biologist, and oceanographer who still works as a National Geographic Explorer. Although now 87, she continues to speak publicly about her concerns for the Earth and its oceans from an incredible wealth of experience and knowledge. One of her numerous accomplishments was in 1979 when she made the first untethered walk on the seafloor at a lower depth than any living human being before. She then wrote about her adventure in her 1980 book,