I found a huge increase in happiness when I moved from Vegas to Denver. I am outside much more often and frequently have the windows open at home. Supposedly th

I found a huge increase in happiness when I moved from Vegas to Denver. I am outside much more often and frequently have the windows open at home. Supposedly the presence of trees has been shown to improve mood (no citation, read the abstract on HN somewhere). Of course, there have been other life changes that have contributed but I feel this is a large reason.