After CDC researchers confirmed that dengue fever had returned to the U.S., a Key West health officer said no new cases had been reported since October 2010.

"Hulking, pitch-black mounds resembling coal have grown exponentially in the last week along the banks of the Detroit River in southwest Detroit, prompting concern about potential pollution from residents and legislators on both sides of the river."

"Republican lawmakers pressed President Barack Obama on the Keystone XL pipeline in a meeting on Wednesday. Initial reports suggested Obama would approve the pipeline, but he did not offer a definitive answer."

"Rep. Paul Ryan (R-Wis.) on Tuesday released his budget proposal calling for approval of the Keystone XL pipeline and slashing the discretionary spending that helps protect Americans from climate-related threats."

"Key weather and climate satellites would get a boost under a new Senate spending proposal."

The white-nose syndrome fungus that is killing bats in their caves has now spread to 22 U.S. states and 5 Canadian provinces.

"Two advocacy groups have come up with a new tactic to show how climate change—and laws to deal with it—could make investments in fossil fuel companies riskier and rock financial markets."

"State Department assessment focused on market response to rejection, rather than the climate impact and environmental cost of a pipeline approval."

"Makers of the specialty cocktails used to crack open the Earth and set loose gobs of oil and gas are sparring once again on behalf of their corner of the energy industry."

"The U.S. is in the midst of an energy transformation. Technologies that free fossil-fuel reserves, once trapped in shale, have radically shrunk natural gas imports. By 2020, the nation is expected to produce more gas than it needs. As the country approaches this milestone, it faces a question long asked in other countries with abundant energy resources: How much should we use at home and how much should we sell abroad?"

"TSAWWASSEN, B.C. — With five coal export terminals under consideration in Washington and Oregon, Northwest residents are grappling for the first time with issues that are old hat in coal states like West Virginia and Kentucky. One of those issues: coal dust."

"Texas was ordered to temporarily stop issuing new water permits for a river system that supplies dozens of Central Texas cities, power generators and petrochemical plants to ensure enough water reaches the last migratory flock of endangered whooping cranes."

"SAN DIEGO — The California Coastal Commission on Friday rejected a Navy explosives and sonar training program off the Southern California coast that critics said could harm endangered blue whales and other sea life."

"They have thwarted the poisons. They have evaded the traps."

"CAMBRIDGE — America’s top military officer in charge of monitoring hostile actions by North Korea, escalating tensions between China and Japan, and a spike in computer attacks traced to China provides an unexpected answer when asked what is the biggest long-term security threat in the Pacific region: climate change."