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Expand chart
Reproduced from StreetLight Data; Chart: Axios Visuals

Transportation is a top contributor to greenhouse gas emissions, but the worst offenders aren't congested cities like New York and San Francisco. Instead, it's sprawling, car-dependent metros like Dallas and Houston, a new analysis finds.

Why it matters: Even dense, traffic-choked cities can offset their carbon output with better urban planning and other, cleaner forms of transportation, says StreetLight Data, which studied mobility behavior in 100 cities to create its new U.S. Transportation Climate Impact Index.

What they did: Using location-based data from mobile phones, StreetLight Data scored each metropolitan area, per capita, by six transportation factors to gain a fuller picture of their climate impact.

  • They looked at vehicle miles traveled (VMT), transit ridership, bike commuting, pedestrian commuting, population density and circuity (the difference between an actual route taken and a straight line between A and B).
  • Instead of counting how many bike paths each city has, they measured how much actual bike commuting people do in each city.

What they found: The New York metro area has the lowest climate impact.

  • Although commuters drive long distances to get to and from work, the widespread use of public transit in Manhattan — and lots of good old-fashioned walking — offset most of those vehicle miles traveled.
  • Dallas, on the other hand, ranked worst because people there mostly drive to get where they're going. Houston didn't fare much better.

Between the lines: Reducing transportation climate impact varies by city.

  • For example, a dense vibrant downtown may have low car use and high walking, but if housing prices and availability force its workers to live 30 miles away, its climate impact could be higher than expected.
  • Adding more low-cost housing downtown could be a good solution.

Go deeper for a look at all 100 cities.

Go deeper

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Photo: Illustration by Cezary Kowalski/SOPA Images/LightRocket via Getty Images

A Food and Drug Administration advisory panel on Friday recommended the authorization of Johnson & Johnson’s one-shot coronavirus vaccine for emergency use.

Why it matters: The FDA is expected to make a final decision within days on the J&J vaccine, which was found to be 66% effective against moderate to severe COVID. An emergency use authorization would allow distribution to immediately begin, helping streamline and speed up the vaccine rollout across the U.S.

Dave Lawler, author of World
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Schiff: "Definitive" Khashoggi report sends clear message to Saudis

Photo: Leon Neal/Getty Images

The report released Friday on the murder of Jamal Khashoggi was short on evidence or new information, but Rep. Adam Schiff (D-Calif.) tells Axios that the “definitive” statement assigning responsibility to Saudi Crown Prince Mohammed bin Salman (MBS) speaks volumes.

What he’s saying: Schiff, the chairman of the House intelligence committee, says that while some intelligence couldn’t be published because of the need to protect sources and methods, “we rarely see something published that is this definitive and I think that's an important accomplishment for the administration.”

Exclusive: Law enforcement organizations back Biden pick for assistant AG

Vanita Gupta Photo: Demetrius Freeman/The Washington Post via Getty Images

Local and federal law enforcement officials are backing Vanita Gupta, President Biden’s nominee for associate attorney general, according to letters sent to the Senate Judiciary Committee and obtained by Axios.

Why it matters: The Major County Sheriffs of America noted Gupta “emphasized that she does not support efforts to ‘defund the police'” and highlighted her desire to improve criminal justice through methods that include increased training for law enforcement officials.