According to the lecture in class and the readings, the evolution of the environmental planning have gone through many eras. In one page, summarize each era highlighting its major characteristics, key players and specific milestones lead to change. Then, in your 2nd page, indicate where do you stand in the conservation/preservation argument? and why? Lastly, Gifford Pinchot and John Muir had very different approaches, highlight briefly what are the common values that they both shared.