Final answer:
The summary sentence encapsulates the inspiration drawn from the West's scenery, the resulting national parks, key legislative acts, and a policy shift towards preserving natural lands.
Step-by-step explanation:
The sentence that best summarizes the first two paragraphs from the excerpt of The book of National Parks is: The lure of the West's stunning scenery prompted the creation of national parks through the influence of artists and writers, kick-started by legislative acts like the Yosemite Grant Act and the Yellowstone National Park Protection Act, which served both to preserve these lands and shift public policy from privatization to conservation.