Green fields are of course a kind of nature. It's interesting that the kind of natural environment humans seem to find pleasant - fields with some trees, animals and some water are quite similar to parts of Africa we evolved in eg. the Serengeti here: https://media.gadventures.com/media-server/cache/19/56/19567...

The woods in England where I grew up were more like this https://www.woodlandtrust.org.uk/media/100142120/flooded-woo... - damp crowded, muddy and not that pleasant to hang out in for any length of time. I think our parks are to some extent a way to make things look more like Africa. (eg Hyde Park here https://www.kidrated.com/kidrated/wp-content/uploads/2015/04...)