More people are trying to factor climate change impacts into life choices like where to vacation and what to eat. Yet scientists are still debating how to accurately measure the impacts of flying or producing meat. 📷: Getty
Emissions on the San Francisco route show as 75 to 101 kilograms per first-class passenger on Google. Myclimate suggests 366 on average, the trade group 142, and the UN body 85.
Google has a financial stake in making people comfortable with flying. Google does not charge a commission on flight bookings, but travel and hospitality operations, including airlines, are among the biggest spenders on Google ads, and consumers feeling uncomfortable about traveling because of its contributions to global warming ultimately could slow travel and ad sales.
"We have a sense that 1,000 calories is a lot, 10 is a little," she says. "Hopefully, we eventually have a sense that a cross-country flight is about 1,000 kilograms carbon dioxide equivalent, about as much as a month of regular living. And that flight has about the same impact on our climate as eating 200 beef burgers or driving a car around for a few months.”
In the San Francisco–to–Los Angeles case, considering the full emissions impacts of flying clearly reveals that traveling slower by bus or car is likely the most impactful choice the traveler could make that month, Pal says. “If they look at the incomplete COGoogle's emissions estimates for that flight would have been higher before last July, when it dropped the impacts of contrails after criticism from airlines, as. Google says it made the decision independently to reduce uncertainty.
Google’s decision to drop the contrails data for now has frustrated some climate experts. "While it is fair and true to say that contrails need to be studied in more detail, the first step in that direction should not be to remove their impact altogether," says Ulrike Burkhardt of the German Aerospace Center’s Institute of Atmospheric Physics.Google that its methodology returned results that were too low even before it removed the contrails.
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