In this research paper, I will discuss the changes that have occurred within the Yellowstone National Park ecosystem since the reintroduction of gray wolves. The document will consist of four sections: The first section will include the story of the disappearance of the gray wolf and its subsequent reintroduction to North America. The second section will explore the political controversy surrounding the reintroduction of the gray wolf to Yellowstone. The third section will contain a discussion of the gray wolf and its impact on the Yellowstone ecosystem. I will conclude my essay by explaining how gray wolves act as buffers against climate change in Yellowstone amid global warming. The story of the disappearance of the gray wolf in the United States dates back to the very first European settlers who colonized eastern North America in the late 16th century. The culling of gray wolves was primarily driven by fear, in an effort to protect livestock and, in some cases, to protect human life within colonies. As more settlers expanded west, the practice of killing wolves increased significantly to protect livestock, including cows, pigs, and chickens. As waves of European settlers expanded westward, they began to deplete populations of deer, moose, and elk. The continued depletion of gray wolves' food sources resulted in wolf populations actively targeting settlers' livestock, causing great financial losses. The tax loss of livestock became such a problem for wealthy ranchers and settlers that they began offering cash rewards for wolf pelts. This practice has given rise to a lucrative cottage industry of professional hunters and trappers. As wolves began to move further west and into Wyoming, they began to decrease the elk and moose population. To address this threat, Congress approved funding in 1914 to eliminate native gray wolves from