There was a circle in Maria Burns' yard where grass wouldn't grow and trees died. She knew what it was: An old natural gas well, plugged when she was a little girl, starting to leak again.

There could be about a million 'orphan' oil and gas wells across the U.S. As they age, they can leak greenhouse gases or unhealthy chemicals.

Many oil company executives celebrated Donald Trump's return to the White House. But now expectations of higher profits are fading amid fears of a recession.