Visitors to national and state parks on Memorial Day may face reduced hours and services. States have budget problems, and national parks have nearly $11 billion in deferred maintenance.
Tennessee Valley Authority says it will phase out 18 older coal-fired generators at three power plants by 2020. Natural-gas and biomass units will replace the coal power as part of a TVA settlement over clean-air violations.
So far, only the Gulf Coast National Seashore has seen oil on its barrier islands. But park officials from Louisiana for Florida's space coast are bracing for more oil.
Shifting climates and needed upkeep are issues facing America’s treasured spots.
It's also a chance for the president to see how national parks - likened to Europe's cathedrals - need political and fiscal support.
Thriving forest pests and melting glaciers may make parks a warning system for climate change effects.
The Interior Department considers a proposal to lift a 25-year ban on concealed weapons in national parks.
Some 1.8 million acres inside and abutting national parks are at risk of development.