Mercury's surface in "enhanced color," a color scheme created to emphasize color differences. This is not what Mercury would look like to the human eye, but by applying mathematical analysis to images, color differences can be accentuated beyond those visible to a person.
Mount Rushmore National Memorial under construction.
The workers had to endure conditions that varied from blazing hot to bitterly cold and windy. Each day they climbed 700 stairs to the top of the mountain to punch-in on the time clock. Then 3/8 inch thick steel cables lowered them over the front of the 500-foot face of the mountain in a "bosun chair." Despite the dangers, no one was killed during the project.
Otters in Glacier Bay National Park and Preserve, Alaska.
The sea otter population of Glacier Bay has increased dramatically in the past 20 years. Ecologists consider sea otters a keystone species here. Otters consume vast quantities of clams, urchins, crabs, and other invertebrates and their presence creates ripples through the ecosystem. NPS photo.
Every day someone like you becomes a wildland wildfire fighter, a teacher, a trail-builder, a museum curator, or a park ranger. Discover your opportunities in national parks. Come to play. Come to learn. Come to serve. Develop your environmental leadership skills. Find a job. Be the next generation to preserve and protect these great places.
With more than 80% of Americans living in urban areas, urban parks are more important than ever. The father of American landscape architecture, Frederick Law Olmsted, said of urban parks:
It is one great purpose of the Park to supply to the hundreds of thousands of tired workers, who have no opportunity to spend their summers in the country, a specimen of God's handiwork that shall be to them, inexpensively, what a month or two in the White Mountains or the Adirondacks is, at great cost, to those in easier circumstances.
Phase One of Navajo Generating Station Options Study Released
Report Examines Impacts and Alternatives for Coal-Fired Power Plant's Compliance with Upcoming Regional Haze Standard
WASHINGTON – The Department of the Interior (DOI) today announced the availability of a report by the Department of Energy's National Renewable Energy Laboratory (NREL) on the Navajo Generating Station (NGS) and the possible impacts of new emission standards for the control of regional haze. DOI commissioned the study and will provide it to the Environmental Protection Agency (EPA), which anticipates issuing a proposed rule for the 2,250-megawatt coal-fired power plant in late spring or early summer of 2012.
NREL's report on the first phase of the study is now available at http://www.doi.gov/navajo-gss. Standards for submitting comments to accompany the report by the Feb. 6 deadline are also available at the website.
The report stems from a DOI agreement with NREL to conduct a comprehensive study investigating the many unique, interrelated and complex economic, social and environmental issues affecting the NGS and the addition of emission control technologies at the facility to improve visibility in nearby National Parks and Wilderness Areas. Under the Federal Clean Air Act Regional Haze Rule administered by the EPA, the NGS must be retrofitted with Best Available Retrofit Technology (BART) air emission control equipment to accomplish this goal. The EPA has agreed to consider the NREL report in developing its BART rule for the NGS, located on the Navajo reservation near Page, Ariz.
NREL conducted public workshops in Phoenix, Ariz., and met individually with a wide variety of stakeholders, tribes and interested parties to gather information for the Phase 1 report. A Phase 2 study is planned to evaluate energy generation alternatives in detail to determine options that merit serious consideration. Although scoping for the second phase has not been conducted, it will likely include conducting detailed technical, economic, environmental, social, regulatory, and policy analyses to thoroughly evaluate the impacts of each generation alternative that passed the analytical screening in Phase 1.
The NGS is owned by numerous entities and serves electric customers in Arizona, Nevada and California and supplies energy to pump water through the Central Arizona Project (CAP). Relying on coal from the Navajo Nation and Hopi Tribe, NGS is operated by the Salt River Project. DOI's Bureau of Reclamation is the largest owner of the NGS facility, which began construction in 1969 and first began producing electricity in 1974.
NREL is the U.S. Department of Energy's primary national laboratory for renewable energy and energy efficiency research and development. NREL is operated for DOE by the Alliance for Sustainable Energy, LLC.