Why Bhutanese are a happy people: 50% of Bhutan is protected as a national park

I came across this article that lists the 10 things that Bhutanese do differently from other people which makes them the happiest people: http://www.lifehack.org/articles/communication/8-things-bhutan-people-differently-that-make-them-the-happiest-people.html

Reason No. 4 is really nice:

Living in harmony with animals and the environment brings happiness to all.