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NRA shows gun rights power, but pushback grows from shootings

The roster of Republican presidential hopefuls who flocked to the National Rifle Association's annual convention reflects the political potency of gun rights. That's despite the group's eroding revenues and an opposition movement that's growing increasingly vocal as the drumbeat of mass shootings marches on. 

How climate change is affecting America's national parks

Extreme weather events are some of the most recognizable changes people see in national parks, but over the next century, slower changes like increasing temperatures and changing precipitation will also take a toll on public lands.