Sustainable aircraft fuel is tricky — electric batteries and biofuels have big drawbacks. A startup is converting carbon dioxide into jet fuel.

Companies have to evaluate their prospects, then come up with a budget and manage crew and equipment logistics.

While coal is having a resurgence as a fuel source, the spike in its use may not last.

Russia supplies more of the EU’s oil and gas than it does coal.

We won’t stop using fossil fuels right away, but the transition to renewable energy could be tricky.

Coal producers are reluctant to ramp up production because it takes a lot of money. And who knows how long demand will last?

Instead, they’ll put about $18 billion a year into renewable energy projects.

The road to a clean, affordable and reliable power grid won’t be straightforward.

One of the hottest new attractions this summer is a car museum that offers visitors the chance to relive their petrol-driven past.

Usually they’d plow them back into drilling new wells. But right now, that’s not what investors want.