Infographic: The Growth of Cobots

Rewiring America study points to the benefits of switching away to clothes dryers, water heaters, and HVAC systems that use heat pumps.

The job was simple: Drill down to get at the source of a persistent oil seep. But the well drilled in Titusville, Pa., changed the course of history.

A new generation of startups is developing the drilling technology needed to reach rocks hot enough to provide clean, sustainable power whenever we need it.

Coal and gas dominate worldwide, though solar and wind power have made large gains in the past 23 years.