To fulfill their carbon neutral promises, airlines must be prepared to bear the costs

Natasha Frost
To fulfill their carbon neutral promises, airlines must be prepared to bear the costs

For aviation, where only jet fuel can power such hulking machinery through the air, this is a harder challenge than for most. Unlike shipping, which has slashed its carbon output by opting for cleaner fuels and more efficient technology, aviation is stuck. Renewable fuel is mostly too expensive or inefficient to be a realistic solution, while battery-powered planes that can carry more than about six people are still a long way off.