In "WeThink," author Charles Leadbeater explores how web communities are evolving.

He specifically highlights their tendency to revisit and adopt older, more traditional forms of social

In "WeThink," author Charles Leadbeater explores how web communities are evolving.

He specifically highlights their tendency to revisit and adopt older, more traditional forms of social order.

Captain Charles Moore of the Algalita Marine Research Foundation first discovered the Great Pacific Garbage Patch,

Captain Charles Moore of the Algalita Marine Research Foundation first discovered the Great Pacific Garbage Patch, an immense, floating accumulation of plastic waste.

He continues to raise awareness about the escalating and detrimental problem of plastic debris choking our seas.

Dr. Chris Charles explores how ongoing greenhouse gas additions affect Earth's climate variability. He explains how geological archives provide new insights into humanity's impact on our planet's

Dr. Chris Charles explores how ongoing greenhouse gas additions affect Earth's climate variability. He explains how geological archives provide new insights into humanity's impact on our planet's climate.

This presentation is part of the "Perspectives on Ocean Science" series, originally recorded in October 2004.