By 2050 or so, the human population is expected to pass nine billion. Those billions will be seeking food, water and other resources on a planet where humans are already shaping climate and the web of life. In Dot Earth, which moved from the news side of The Times to the Opinion section in 2010, Andrew C. Revkin examines efforts to balance human affairs with the planet’s limits. A Times reporter for 14 years, Revkin is the Senior Fellow for Environmental Understanding at Pace University’s Pace Academy for Applied Environmental Studies.

Conceived in part with support from a John Simon Guggenheim Fellowship, Dot Earth tracks relevant developments from suburbia to Siberia. Click for a narrated slide show on the roots of Revkin’s journalistic journey.