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The Climate Question: Can we trust Google’s carbon footprint calculations?

Magazines & Reviews

14/05/2023 GMT

Can we trust Google’s carbon footprint calculations?

BBC World Service - The Climate Question, Can we trust Google’s carbon footprint calculations?

How Google significantly miscalculates the climate impact of planes and trains.

If you want to check the climate impact of a journey before buying your tickets, then beware. Google has been seriously underestimating how much worse planes are than trains.

If you are planning a trip, but you want to check the climate impact before choosing how to get there, then beware. Google has been seriously underestimating the carbon footprint of plane flights, and overestimating that of some train journeys. And its calculations don’t just appear in its search results, but also feed the sites of more and more online booking companies, like Skyscanner and Booking.com. 
To be fair, carbon footprints are actually very hard to get right, as the BBC’s Climate Editor, Justin Rowlatt, discovers on his own trip to Rotterdam. On the way out, he takes the Eurostar high-speed train, whose carbon emissions depend on the weather over the North Sea that day. On the way back he catches a plane, whose climate impact… also depends on the day’s weather conditions over the North Sea. 
So what is Google doing to fix its methodology and can we trust carbon footprint calculations at all? And do passengers even really care that much about the environmental impact of their journey, or should they be made to pay for it directly? 

Presenter Justin Rowlatt is joined by:  
Doug Parr, chief scientist and policy director at Greenpeace UK 
Dr Feijia Yin, assistant professor for the climate effects of aviation at Delft University of Technology 
Andrew Murphy, head of sustainability at Eurostar 
Sola Zheng, aviation researcher at the International Council on Clean Transportation 
 
Email us: theclimatequestion@bbc.com

Producer: Laurence Knight  
Production Coordinators: Sophie Hill and Debbie Richford
Series Producer: Alex Lewis  
Editor: China Collins  
Sound Engineer: Tom Brignell

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