How Do Subsea Trees Work? A subsea Christmas tree is the pressure-containing valve assembly mounted on a subsea wellhead that controls, monitors, and safeguards flow from (or injection into) a subsea ...

Bald Cypress swamp at Atchafalaya basin in Louisiana. When is a tree not a tree? We often think of urban trees as simply poles in the ground, islands unto themselves, but they are ecosystems all their ...

Urban trees often stand at the center of plans to fight rising city temperatures. Their cooling power seems simple and effective. But new research shows that the truth is more complex. Trees do cool ...