Marie Cusick

Regal fritillary butterflies have largely disappeared from the East Coast, save for a military base in central Pennsylvania. A few days each summer, hundreds descend for guided tours to see them.

The regal fritillary butterfly has largely disappeared from the East Coast, save for a surprising refuge on a military base in Pennsylvania. A few days each summer, hundreds descend for a tour.

Forty years ago, the U.S. nuclear industry suffered its worst nuclear accident. Today, the remaining reactor at Three Mile Island is slated to close because of cheaper competition from natural gas.

A 1970s-era status board at Philadelphia's 30th Street Station has been making a familiar clickety-clack sound for decades, but now, as it's set to be replaced, there's an effort to save it.

Homeland Security and the FBI have blamed Russia for a series of cyberattacks on U.S. power plants. The industry is stepping up efforts to protect the electric grid.

Gas and oil companies pay royalties to millions of American landowners. But a growing number accuse energy companies of cheating them out of their fair share.

A Maryland dam has been helping to clean up the Chesapeake Bay by holding back sediment that can harm aquatic life. But now the dam's sediment pools have filled up earlier than projected.

The nuclear industry is struggling with aging plants and competition from cheaper natural gas. Now, touting itself as another form of "clean" energy, it's lobbying state lawmakers for help.

Proposed budget cuts to the Environmental Protection Agency could leave state environmental agencies doing more with less money. But many say they are already strapped.

The projects will need to be approved through the Federal Energy Regulatory Commission, but a resignation will leave that five-person panel with just two members — too few for a quorum.

Pipelines are center stage in a fight over the nation's energy future, concerns about climate change and private property rights. Donald Trump's election means the battles are likely to continue.

Hillary Clinton and Donald Trump have starkly different views on energy policies. We hear from the people who are advising the candidates on everything from clean energy to fracking.

More than 100 nations will sign the climate change deal agreed to in December. It will eventually commit nealy all the world's governments to cut back on greenhouse gases that cause global warming.

The same bad news that is hurting the oil industry is also affecting gas companies. In Pennsylvania, drillers are laying off workers and slashing spending in the face of low commodity prices.

The sudden ups and downs of the oil and gas industry can feel like whiplash for rural communities seeing an influx of workers. Affordable housing has been a challenge. With the curren...

Driven by new regulations and fracking, more coal power plants are retiring for cheaper, cleaner-burning natural gas. But scientists have yet to work out the fossil fuel's imperfect climate footprint.

Wendy Lee, an anti-fracking activist and philosophy professor at Bloomsburg University of Pennsylvania, has always protested peacefully. So she was stunned last winter when a state trooper came to her home to ask her about eco-terrorism and pipe bombs.

The trooper was investigating an alleged trespassing incident that involved Lee ...

Environmental groups cheered New York's decision to ban the practice, and some in the industry say when it comes to good-paying jobs, New York's loss is Pennsylvania's gain.

Most of the noise created by natural gas development is temporary. After drilling and fracking, the workers and equipment are gone. But compressor stations can stay noisy for years — even decades.

Locals in Lancaster County, Pa. — where the Amish community plays a big part in agriculture and tourism — are speaking out against reality TV shows like Breaking Amish and Amish Mafia.