Arizona is the 48th state in the United States, and is home to dramatic natural landscapes, rich history and bustling ...

If you’re adding a tree in the coming weeks, here’s a seven-step rundown on the current, generally accepted process used by ...

MIT Technology Review visited the eerie tree farms Apple and other companies rely on to try to cancel out their carbon emissions. Are they really helping to fight climate change? Or are they making ...

If you're thinking of adding a street tree out front, Penn State urban forester Vincent Cotrone has some recommendations.