I'd say that, in addition to actually taking my brother and sister and I camping and hiking and river rafting all our lives and introducing us to the power of natural landscapes, his [my father's] biggest impact on my thinking has been to always argue that the "spiritual case for Nature" was not going to outweigh the needs of 7 billion people and to insist that law, science and economics were the critical frameworks through which we had to defend the value of nature.