We show that for every enumeration degree $a there exists an e-degree c such that $a \leq c , and all degrees b, with $c \leq b , are properly Σ 0 2.

We show that for every enumeration degree $a < 0'_e$ there exists an e-degree c such that $a \leq c < 0'_e$, and all degrees b, with $c \leq b < 0'_e$, are properly $\Sigma^0_2$.

This book draws on the authors' wide range of experience, to provide a greater understanding of the different dimensions of environmental engagement. It is essential reading for students, researchers, and practitioners of architecture, landscape architecture, urban planning, design and health sciences.