This is the best summary I could come up with:

Contrails - or condensation trails - can trap heat in the atmosphere and are responsible for more than a third of aviation’s global warming impact, according to the 2022 Intergovernmental Panel on Climate Change (IPCC) Report.

Using AI-based predictions based on satellite imagery, weather and flight path data, Google identified routes that avoided the atmospheric conditions needed to create these clouds.

The experiment, led by Google Research, American Airlines and Bill Gates’s Breakthrough Energy, has been praised for its potential to mitigate the climate impact of flying.

While contrail avoidance could be a significant step towards reducing the climate impact of flying, environmental groups warn against viewing it as a silver bullet.

“It is vital that we address the climate-wrecking impact of contrails but this must be accompanied by an urgent reduction in air traffic,” says Hannah Lawrence of Stay Grounded, a global network promoting climate-friendly alternatives to flying.

Finlay Asher of Stay Grounded, an industry group that campaigns for a sustainable future for aviation, notes that previous research carried out by UK-based aerospace company Satavia and NATS (National Air Traffic Services) has shown that routes designed to avoid contrail formation could actually save on fuel.

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