Sandeep Bathala and Carmen BarrosoSandeep Bathala and Carmen BarrosoJoin a Grist live chat on population issues on Monday, Oct. 31, at 1:00 p.m. Eastern / 10:00 a.m. Pacific, marking the occasion of the world population hitting 7 billion. We’ll have two experts on hand to answer your questions: Sandeep Bathala of the Woodrow Wilson International Center for Scholars, formerly director of the Sierra Club’s population program; and Carmen Barroso, director of International Planned Parenthood Federation, Western Hemisphere Region. The chat will be moderated by Grist Senior Editor and Queen of Pop(ulation) Lisa Hymas. Ask questions in the box below, or tweet your questions to @grist. 

Bone up on population by checking out our 7 billion comic, our population facts and figures, and the rest of our special series on the topic.

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