What nineteenth century philosophy stressed the importance of communion with nature?

Transcendentalism is the correct answer.

Explanation:

Transcendentalism was a philosophical movement that developed during the 1820 s and 1830 s in the United States. It was again the intellectualism and spirituality of that time. According to transcendental philosophy, all human beings know themselves and the world around them which goes beyond what they perceive. A transcendentalist is one who accepts these ideas as a way of life not as religious beliefs.

you can't, there's no way sorry