01:16
Coasts Are Arbitrary
Geophysicist and geologist Tanya Atwater notes that the line between oceans and continents, commonly known as the coast, is actually very arbitrary and subject to change over time. She also talks about implications of global warming for coastal regi...
01:14
Coastline Threats
Explorer and environmentalist Jean-Michel Cousteau talks about threats to the world's coastlines, focusing on the disproportionate percentage of population that lives in coastal areas.