An in-depth look at the Grand Canyon ecosystem reveals an unprecedented convergence of threats.

"Republican senators introduced legislation today that would block White House efforts to require federal agencies to consider climate change in environmental analyses of proposed projects."

"The Obama administration is launching a significant new effort to reach out to marine recreational fishermen, an economically and politically powerful group that has previously felt shut out by the new administration."

"A panel of experts convened on Tuesday by the Nuclear Regulatory Commission to discuss how the agency should approach tritium leaks at reactors suggested that the biggest risk that nuclear operators faced was the erosion of public trust."

"The Supreme Court on Tuesday forcefully struck down a federal law aimed at banning depictions of dog fighting and other violence against animals, saying it violated constitutional guarantees of free speech and created a 'criminal prohibition of alarming breadth.'"

"A tiny Asian fly that is new to North America is threatening much of the West Coast fruit industry and has been detected in Florida too, warn state and federal agricultural experts."