At my previous home I planted a dozen fruit trees, plus some redbuds, a few serviceberry, a maple (for an Earth Day), katsura (sp?) and a few others. Sadly, most of them were cut down by the new owner, plus many of the older, taller trees. But that property was in a transition from 'a field 20 years ago' to suburban yard, so it could use some more trees. Some trees also grew themselves, namely several black walnuts (I had dumped a pail of old walnuts someplace) and a peach tree. I did sell over a thousand or so trees to people at my workplace two different years, I was very active in the Environmental Club, so I guess that was my big tree planting effort.
Although we never cut down healthy trees for firewood, just take dead wood or what others have cut for whatever reason, I do kill a lot of trees. We live in a very naturalized area, and nature and the squirrels and birds grow way too many trees too close together, and we have to get rid of some or we wouldn't have anyplace to walk or garden or grow fruit.
I bought my mom's house over 5 years ago, so now I live where I grew up. My family bought land that had been farmed. My father planted 50+ fruit trees and some walnuts, spruce, and other trees. I recently was startled by a photo from 43 years ago, there were just the spindly fruit trees here and there, otherwise it had that 'used to be a cornfield' look in most places. Now it looks pretty much llike a forest, although there are a few more paths and open spaces than a forest would have. Since we have many fruit trees still, we are always whacking down or mowing black walnut trees (once you have one and some squirrels, you get them everywhere) plus baby fruit trees, pulling out baby oaks, and then the weed trees like dogwood, boxelder, silver maple, poplar, etc. If you have a large yard and don't use chemicals or mow much of it, trees grow themselves, you don't need to plant them. But we are at max tree capacity, so we will just be killing the baby trees from here on out. Sounds cruel, but we are just protecting the trees and plants we already have.