The U.S. Department of Energy (DOE), based in Washington, D.C., funds and manages 40 percent of the high-energy physics, nuclear physics, and fusion energy sciences research in the United States. The agency's programs also ensure the availability of medical and research radio isotopes. The isotopes are used to diagnose and treat cancer, heart disease, and other medical problems. The DOE conducts geophysics, genomics, climate change, life sciences, fossil energy, and environmental science research. It sponsors research at universities across the United States. Research is conducted by principal investigators, post-doctoral students, and graduate students. The DOE has established clean fuel initiatives. Its National Energy Policy promotes the development and deployment of clean, efficient, and reliable energy systems. The agency's ENERGY STAR (R) program, established in 1992, identifies energy-efficient products. The Weatherization Assistance Program assists low-income home owners with energy efficiency support. The DOE manages Argonne National Laboratory, Fermi National Accelerator Laboratory, Los Alamos National Laboratory, Oak Ridge National Laboratory, and 20 other research facilities. The agency protects nuclear weapons and promotes international nuclear safety. It also transports and stores radioactive waste. The agency produces 'This Week in Petroleum,' 'Gasoline and Diesel Prices,' 'Short-Term Energy Outlook,' and other reports.