Southern Californians are worrying about flooding, mudslides and their trees

As coal mines in the U.S. close, an entrepreneur has a plan to pair mines with carbon sinks.

Yes, it's Arbor Day again. Don't hug a tree, plant one. Or, calculate the value of what a tree is doing for the environment.

The disease could wipe out a third of Britain's forest, and landowners and tree growers could lose tens of millions.

Environmental writer Tim De Chant says gauging income inequality is as simple as looking at a neighborhood's trees.

You can measure an area's income inequality in pay stubs, Census numbers and… its tree cover? Environmental writer Tim De Chant argues that sometimes you can't see a neighborhood's wealth for the trees.

Oak and Willow on the ones and twos

Oh there are tree nerds. Just as there are Dr. Who nerds and Battlestar Galactica nerds and Commodore 64 nerds, there are tree nerds. And now they…