50 million years ago during the Eocene, the Earth was much hotter than it is now, with levels of greenhouse gases methane and carbon dioxide in the atmosphere far higher than today. There was very little ice on the Earth … Continue reading
An ancient family of trees, the cypresses, got their start on the supercontinent Pangaea before it split apart. New genetic research indicates this continental split helped shaped the evolution of these trees, which now include giant redwoods and sequoias. More … Continue reading