It may not be true that trees cause pollution, as former President Reagan once asserted.

Diagnostic trees breakdown a "why" key question, identifying all the possible root causes for the problem.

In 2006 a falling tree caused stones to break away, damaging the house's main gas line.

Some years ago, there was some discussion of the idea that trees cause air pollution.

During the 2011 Halloween nor'easter, a tree on the lines caused significant outages.

Mud and trees also caused problems along the highways in both states, as several hillsides collapsed.

During the 1980 campaign, he asserted that trees caused 93 percent of the nitrogen oxides in the atmosphere.

The trees met like a bower overhead, and caused a half-darkness.

Mark moved as quickly as possible, but the dark and the close-packed trees caused him to lose ground on who- ever was up there.

The tree lands on the ambulance and causes further injuries to the plaintiff.