get back to nature
To embrace or begin to embrace a lifestyle that values and attempts to increase time spent outdoors or in rural or wild places, and related activities, in contrast to modern urban life. My hippie sister really wanted to get back to nature, but I like modern technology too much to do that.
get (or go) back to nature
return to the type of life (regarded as being more in tune with nature) that existed before the development of complex industrial societies.