COLUMBUS, Ohio, Aug. 19 -- Ohio State University posted the following news: * * * Research confirms tropical regions as historic methane source * A new analysis of ice cores collected from the Andes in Peru has produced the first global record of historical tropical methane, filling a critical gap in our understanding of the origins of Earth's greenhouse gases. By examining small air bubbles trapped in ancient ice, scientists studied a 2,000-year-old record of how atmospheric methane evolved over time. They discovered that the concentrati more PR