Much research and debate in the scientific community is devoted to the question the impact forests have on in the capture or sequestration of carbon dioxide, the primary gas that causes the climate-warming “greenhouse effect.†Are more forests the key to slowing the rate of rising global temperatures or is it too optimistic to think they can capture enough of the world’s CO2 emissions to solve the problem? Hear two of Harvard’s most active climate researchers tackle this question from different perspectives, atmospheric chemist Steven Wofsy and forest ecologist Andrew Richardson, on Wednesday, November 9, beginning at 6 pm. Free and open to the public, Geological Lecture Hall, 24 Oxford Street. Part of the Challenges and Choices lecture series. For more information, visit www.hmnh.harvard.edu.