Tree rings are record books of annual growth, and the width of each ring is correlated to that year's environmental conditions. In a new study, Cameron Lee and Matthew Dannenberg use machine learning ...

There’s some big machines in your yard waking up. They’re your trees! It’s amazing to follow what goes on inside trees as they wake up and they don’t make any noise. I asked Dennis Swartzell of ...

This transcript has been edited for length and clarity. Every few years, the world’s top scientists come up with hundreds of different scenarios, all aimed at limiting global warming to 2 degrees ...