Seeing green spaces does have an impact on our ability to self regulate, which is helpful for both sadness and depression, but the advice is not formulated well. I have adhd, so my version would be “make getting outside the most important thing, guilt yourself for hours, force yourself finally, then go for an aimless three hour walk that does actually really help with eating and sleeping regularly, then build from there.” That’s obviously fucking nuts to say to someone else, so people say go outside instead