Here are some articles about the importance of nature: 

Nature: How connecting with nature benefits our mental health

This report discusses how nature can help with mental health, and how even watching nature documentaries can be beneficial. 

Nature's importance to our health

This article from Friends of the Earth UK discusses how nature provides clean water, fresh air, and food, and how it helps prevent floods and regulate the weather. 

Significance of Nature

This essay discusses how nature is essential for human survival, and how it provides us with food, water, air, and sunshine.