In the three weeks since the federal government shutdown California’s National Parks have been facing unique challenges. Most remain open but with restricted access, but some, such as Sequoia-Kings Canyon and Joshua Tree National Parks, have been closed due to health and safety concerns, and to protect the environment. For Yosemite, the state’s most popular park, visitors will find a blend of business as usual, along with some closed trails and restricted activities. KPFA’s Vic Bedoian visited the Park and its gateway community of Mariposa….