This morning the New York Times published what they are calling the most detailed map of auto emissions in America. In it, they remind us that transportation is the largest source of greenhouse gases in the US today and that most of it comes from our driving habits within metro areas. See below charts.

Not surprisingly, if you look at total on-road emissions, the biggest cities -- New York and Los Angeles -- are at the top of the list. But you also have car-dependant regions like Dallas-Fort Worth that punch above their (population) weight in terms of total emissions.

Now, here's where it gets interesting. The story flips as soon as you adjust for population.

On a per capita basis, New York is pretty much at the bottom of the list. It is yet another reminder that one of the most sustainable ways to live is in a dense urban environment where it is possible to get around without the use of a car. New York is, of course, one of the best places in the US to do exactly that.

Charts: New York Times

Garrett Dash Nelson recently published a study looking at urban density on a cell-by-cell basis for a number of US cities. Each "cell" is a 30 arc-second grid cell, but you can think of them as being approximately one square kilometer. The goal of the project was to better define urban density and do it in a more granular way. City averages don't tell you a whole lot about how neighborhoods vary, and they can be skewed by the denominator you use. i.e. Where are you drawing the urban boundary?

You can play around with his interactive study, here. Each city can be explored according to its 200 most dense cells. One interesting takeaway -- though it is probably not all that surprising to this audience -- is that New York City is really a unique place when it comes to American cities. If you look at the above chart (sourced from CityLab), you'll see that most other US cities don't come close to it in terms of urban density. New York's 200th densest cell is still denser than the most dense cells of Boston, the Twin Cities, and of Dallas.

The y-axis is the total population in each grid cell.

The University of Toronto School of Cities recently looked at the changing economic geography of Fortune 500 companies across the US from 1975 to 2017. Here is a diagram of the results taken from CityLab:

New York sits at the top with 70 corporate headquarters as of 2017. But the San Francisco Bay Area is now the second largest center with 35 headquarters – a testament to tech.

The study does, however, omit service firms, as these weren’t tracked in Fortune’s list back in 1975.

Also noteworthy is the specialization that has taken place across specific cities and regions. Here is another excerpt from CityLab:

America’s headquarters geography reflects the substantial variation and specialization of the U.S. economy. New York leads in finance and business services, consumer services, and goods and materials. But Houston leads in energy, San Jose in tech, and Chicago in retail and wholesale. Chicago also ranks second in consumer services, and goods and materials, and Dallas takes third in energy. Other cities like Nashville and Minneapolis take third in consumer services, and goods and materials, respectively.

The full article can be found, here.