Rising Tides: Changes in Sea Level along the Maine Coast  video (13 min) [YouTube] Dr. Joseph Kelley is a marine geologist who studies the sea floor, coastlines, and sea level. In this video, Dr. Kelley explains how we know that ocean levels are rising, and explores evidence for past and present changes in sea level read more J. Kelley & C. Isenhour’s Educational Videos: Rising Tides: Changes in Sea Level along the Maine Coast & Relationship between Climate Change & Consumption