Dr. James Farquhar with first author Dr. Harry Oduro and Dr. Kathryn Van Alstyne published an article in PNAS, May 14, providing a tool for tracing and measuring the movement of sulfur through ocean organisms, the atmosphere and the land in ways that may help prove or disprove the controversial Gaia theory. Media coverage included Wired News, Daily Mail, Science Daily, University Today, Science Codex and Market Watch.