As you’ve probably heard, the U.S. government has shut down for the first time in 17 years.

That means many of the agencies responsible for weather, climate and energy regulation are largely shuttered as well, forced to whittle down their staffs to only their most essential employees. These include:

The Environmental Protection Agency. The EPA is taking one of the biggest hits of any federal agency — about 96 percent of the agency’s staff aren’t coming to work, meaning the agency, in EPA Chief Gina McCarthy’s words, has “essentially shut down.” The staff that will be coming to work include employees who “ensure continued public health and safety, including safe use of food and drugs and safe use of hazardous materials,” as well as workers who protect federal lands and research property and provide disaster and emergency aid. Managers of some Superfund cleanup sites must come to work if stopping the work would pose a threat to human health; pesticide regulators, staff who write and implement major air pollution rules, and staff who are in charge of the EPA’s proposal for renewable fuel standards, on the other hand, will stay home. National Parks. Google celebrated the 123rd anniversary of Yosemite National Park today; ironically, because the park — and all other national parks, monuments and government-funded museums — is now closed to the public. The oil and gas industry, however, will keep on drilling on public lands, though the process for issuing new oil and gas permits will be halted. Only a few employees will be at work overseeing drilling activities such as “well shut-ins, re-completions, and downhole/equipment changes in drilling/plugging operations.” The Department of Energy. The DOE is losing 69 percent of its staff. Most employees conducting energy research are staying home during the shutdown, but those employees who oversee nuclear materials and power grids, as well as one employee from the Office of Energy Efficiency and Renewable Energy and a few employees responsible for environmental cleanup are still at work. NASA. The agency is taking the biggest hit of all – 97 percent of its employees are staying home due to the shutdown. Scientists at the international space station, of course, are still at work, and the agency is making sure they’re still being taken care of. NASA’s Asteroid Watch Twitter account, however, is down, which means it won’t be warning the public via social media of potentially dangerous asteroids. The account clarified that “many observatories, astronomers are watching the skies” so at least they’ll be on the lookout, even if they won’t be tweeting.

The good news, however, is that a few government agencies and organizations have managed to skirt the shutdown. Here are a few of the major energy and climate-related exceptions: