Trees grow roots to compete with other plants, a recent recent research project suggests:  04obtree.html?_r=1&ref=treesandshrubs

For those thinking about what kind of christmas tree is greenest, a post from the Oregon Cooperative Extension.  Of course they recommend an Oregon grown tree, but read on:  Greenest Christmas Tree

Recent article suggests warming forests may soak up less carbon: Forests soak up carbon, but for how long?

Pine Beetle Story:  story.html

A newly produced map of worldwide forest heights.  The Pacific Northwest has some of the tallest:  Forest Map

Inventory in Seattle to value urban trees:  valuing trees

Seattle business salvaging urban trees:   urban salvage