Ranking the Climate Impact of Transportation in the 100 Largest U.S. Metro Areas

This performance ranking separates the fakers from the legit operation to reduce carbon emissions from transportation.

1 minute read

January 21, 2020, 6:00 AM PST

By James Brasuell @CasualBrasuell


Manhattan, New York City, New York

dibrova / Shutterstock

Streetlight Data released its "2020 U.S. Transportation Climate Impact Index," which ranks the 100 largest metropolitan areas on climate impact using performance-based transportation metrics.

As explained in an article that introduces the index, the rankings boil down to the difference between car travel and low-carbon alternative modes of travel. Thus, the number one metropolitan area probably won't come as a surprise: New York City-Newark-Jersey City. Coming in second is San Francisco-Oakland-Hayward, and coming in third is Madison, Wisconsin.

Streetlight Data released a package of data and articles to help offer insight into the details of the index beyond the rankings. So the entire list of metropolitan areas and rankings by key metrics in the index are also available.

The decline of the coal industry in recent years has pushed transportation to the top of the list as the largest emitter of greenhouse gas by sector. Streetlight Data puts a finer point on the origins of that leading source of greenhouse gases.

Friday, January 17, 2020 in Streetlight Data

Young Professional

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban and Environmental Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban and Environmental Planner

Get top-rated, practical training for planners

"Planetizen federal action tracker" logo superimposed over black and white image of US Capitol dome.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

September 16, 2026 - Zachary Whalen

Overlapping highways

The state-sanctioned urbicide of Austin

People don’t kill cities. Freeways do.

September 8, 2026 - Benjamin Schneider

Geese flock to a frozen pond in Aurora, Colorado. There are houses in the background.

Colorado’s Largest Data Center Could Rise Next to Homes — Without a Public Hearing

The proposed campus would consume 11 times the power of Denver International Airport; as it has across the country, opposition mounts.

September 17, 2026 - Capital & Main

A coal power plant in Iowa billows smoke into the air.

Nation's most wind-powered state turns to coal as data centers increase energy demand

For the first time in decades, Iowa has increased its generation of coal power.

September 17 - Inside Climate News

A sign on a fence describing the rain garden behind it.

NYC cools commuters with city's first rain garden above a bus stop

New York City officials say the plants in the rain garden can absorb 16 gallons of rainwater during heavy storms.

September 17 - Gothamist

A map showing Brightline West's intended route from  Las Vegas to Rancho Cucamonga, California.

Brightline West’s future may rely on $6 billion federal loan

The company has until Nov. 2 to make a $400 million equity investment into its proposed high-speed rail line.

September 17 - Smart Cities Dive

FREE Course: Walkable City 1: Why Walkability?

After describing his path towards focusing on walkability as the essence of good planning, Jeff Speck marches through his five principal reasons for making more walkable places.

Reinventing Malls: Planning Alchemy—Turning Gray Fields Into Gold

The course focuses on the opportunities and imperatives that shape reinvention of mall sites.