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The 25 most-visited national parks in the contiguous U.S. are projected to see a nearly five-fold increase in extremely hot days per year by 2050 under a 'warm wet' scenario, and up to a ten-fold increase under a 'hot dry' scenario. These trends, combined with record-breaking visitation, increase the risk of heat-related illnesses for visitors and threaten biodiversity and infrastructure. The National Park Service is implementing adaptation strategies, such as the Climate Change Response Strategy, to mitigate these risks.

The document argues that the Town of Tusayan's application for special use authorizations on Kaibab National Forest land is not in the public interest because it enables a massive resort development by Gruppo Stilo USA. The authors contend that the project threatens the Redwall-Muav regional aquifer, which supports critical springs in Grand Canyon National Park and the water supply of the Havasupai Tribe. They further argue that the development would cause light and noise pollution, overwhelm park infrastructure, and harm wildlife habitats, including elk calving grounds and antelope fawning areas. The letter urges the Forest Service to deny the application before initiating a National Environmental Policy Act (NEPA) process.

The report identifies power plants as the primary source of sulfate particles causing regional haze in U.S. national parks, which significantly reduces visibility and diminishes visitor enjoyment. An analysis by Abt Associates estimates that eliminating power plant haze would provide a total annual benefit of $7.7 billion, comprising $4.3 billion in recreational visibility and $3.4 billion in residential visibility. The document highlights that improved visibility could increase park visitation by 10% to 25%, generating hundreds of millions of dollars in revenue and thousands of jobs for local communities. It recommends the implementation of 'best available retrofit technology' (BART) and a shift toward natural gas and renewable energy to achieve the national goal of remedying visibility impairment.