What reason does Edward Abbey give to prove that he is the best person to comment on the harm the building of the Glen Canyon Dam has done to the land?

Edward Abbey is considered the best person to comment on the harm the building of the Glen Canyon Dam has done to the land due to his intimate knowledge and experience with the area. Abbey worked as a park ranger in the region, which gave him firsthand experience of the landscape, its natural beauty, and the wildlife that inhabited it. He was able to observe the changes that occurred as a result of the dam's construction.

In his writings, particularly in his book "Desert Solitaire," Abbey expresses his deep love for the wilderness and his profound sense of loss and outrage at the damage caused by the dam. He provides detailed descriptions of the beauty and uniqueness of the Glen Canyon before it was flooded, and contrasts this with the destruction caused by the dam.

Abbey's passionate and informed commentary on the environmental impact of the Glen Canyon Dam is based on his personal experiences and observations, making him a credible and compelling critic of the project.