This swamp maple is in my yard in the old section of Greenbelt and I'm worried about it. It may be declining but maybe if I had some of the branches removed, the tree would be under less stress. Attached photos show more detail. The tree is within a retaining wall area facing west. The tree provides much appreciated shading to the side of the house, saving me some AC costs. You'll see one large branch where the leaves are especially sparse. I'm wondering if it would help the tree to have that one large branch removed, as well as have some selective pruning done elsewhere. I'm thinking that if the tree did not have to nourish so many branches, maybe it could flourish a bit more in the retaining wall area. I've learned a little bit about greenfutureus.com as a tree service. Their website seems to suggest that their staff are very well-informed about trees. What thoughts might you have about the condition of this tree, about selective pruning as a way to help it, and perhaps about the credentials and experience listed at greenfutures.com or anything you may know about this company?>