Glulam beams are actually pretty ecologically sound. They're made from laminations of smaller pieces of wood, so there's less demand for old-growth trees. It can also be made of the smaller pieces left over from cutting larger pieces. And of course, trees are a renewable resource, if managed right via sustainable forestry.

Another benefit to them is that a single glulam beam can replace several ordinary dimensional pieces of lumber. So you end up using less wood because they're stronger.

And when used as architectural elements, they're attractive.

https://www.apawood.org/glulam