Houthi rebels in Yemen have claimed responsibility for the attacks, but Secretary of State Mike Pompeo accused Iran of launching an "unprecedented attack on the world's energy supply."
The attacks on oil facilities by the Iran-backed Yemeni rebels sent large plumes of smoke into the air, the trails visible from space, and impacted an estimated production of 5 million barrels a day.
The legendary energy executive, whose name symbolized big oil, died Wednesday at age 91. He founded the company that became Mesa Petroleum and later began a hedge fund focused on energy investments.
While wind energy is marketed as the future's green energy solution, turbines last only about 20 years, and disposing of their behemoth fiberglass blades is both complicated and costly.
Large-scale forest thinning in northern Arizona to prevent wildfires is behind schedule. But a new program is taking low-value logs and shipping them across the Pacific to markets in Asia.
Abandoned gas and oil wells dot many states. These orphaned sites need to be capped and cleaned up, but doing so is difficult when the responsible companies have gone bankrupt.
Hundreds of coal miners in Wyoming are still out of work two months after their employer declared bankruptcy. It's a moment of reckoning for a town some think relies too much on the energy industry.