Houston claimed the No. 1 spot among the 50 most visited in the U.S. with the lowest carbon footprint. Sean Pavone/Getty Images

People looking to travel to a sustainable city probably don’t have Texas spots at the top of their lists. Images of oil, cars, and blasting air conditioners spring up. The Texas power grid, no one need remind us, is barely hanging on.

But Texas blew other states away for lowest carbon footprint per capita, landing Houston at the top of the list compiled by travel blog Park Sleep Fly. Austin followed (No. 3), then San Antonio (No. 4) and Dallas (No. 9). Only Florida appeared twice in the top 10, and none matched Texas with four cities.

Among the 50 most visited in the U.S., those with the lowest carbon footprint are:

1. Houston
2. Los Angeles
3. Austin
4. San Antonio
5. Tampa, Florida
6. Salt Lake City
7. Phoenix
8. Miami
9. Dallas
10. Portland, Oregon

Houston is not exactly a green place, with less-than-ideal utilization of public transportation. It and Dallas tied for third place among least sustainable cities in the same report.

“Public transit isn’t the most popular mode of transportation in Houston, but it does exist,” an online publication called TripSavvy drably admits. The city takes credit for employing “nearly one third” of the nation’s oil and gas extraction workers.

On the renewable side, however, Houston claims more than 100 solar energy companies, and at least half of its corporate research and development centers pursue “energy technology and innovation.” And its huge population spreads the load, leaving only 14.6 metric tons of carbon dioxide per resident — the same as Los Angeles. Big cities seem to have an advantage in this rating system.

Austin is just behind Houston at 15 metric tons per capita, neck-and-neck with San Antonio at 15.2. These two cities have smaller populations to distribute their total footprint, but are generally seen as eco-friendly. Austin got a big head start in 1991 with the introduction of the Austin Energy Green Building program — the first of its kind in the whole country — which created an evaluation system for individual building sustainability that’s still in use. Dallas' carbon footprint is the largest of the Texas cities in the ranking, at 16.5 metric tons per capita.

As such a multifaceted issue (especially tied up in economic concerns), sustainability is hard to pin down from city to city. The multiplicity of this list is yet another indicator that Texas as a whole is a much more nuanced place than many people think.

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This article originally ran on CultureMap.

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9 can't-miss Houston business and innovation events for June

where to be

Editor's note: From lightning pitches to a female-focused AI summit and energy conferences, there's still plenty to do as Houston settles into the summer. Here are the Houston business and innovation events you can't miss in June and how to register. Please note: this article might be updated to add more events.


June 3 – Founders Live Houston 

Watch five Houston founders present their 99-second pitches at Founders Live Houston. Competing teams include AyeDu (Vinita Gupta), Omniscale (Tony Hernandez-Ferman), AnswerPath (Chris Mullins), Katana.video (Sam Bhattacharyya) and TraceWrap (Laketta B.).

This event is Tuesday, May 3, at 5:30 p.m. at the Ion. Register here.

June 4 – Center for Human Performance Research & Networking Event

Rice University and Houston Methodist's Center for Human Performance will host an event to support its work in the study of exercise physiology, injury prevention and rehabilitation. The organizations will share more information on seed grant opportunities, and the event will feature presentations from Rice and Houston Methodist leaders, networking sessions and a poster showcase.

This event is Wednesday, June 4, from 3-5:30 p.m. at the BioScience Research Collaborative at Rice University. Register here.

June 12 – Transition on Tap

Meet and hear lighting pitches from eight of Greentown Labs’ newest startup members. Attendees can network with entrepreneurs, investors, corporate leaders, philanthropists, students and other climate champions. Georgina Campbell Flatter, CEO of Greentown Labs, and Victor Martinez, Greentown's memberships manager, will also speak.

This event is Thursday, June 12, from 5:30-7:30 p.m. at Greentown Houston. Register here.

June 16-18 — Energy Drone & Robotics Summit

This three-day summit, the largest of its kind, will connect 1,500-plus leaders in the global energy/industrial robotics, drone and data sectors. Attendees will glean the latest ideas, use cases, best practices, tech and trends from a wide variety of robotics and drone industry experts.

This event begins June 16 at Woodlands Waterway Marriott. Register here.

June 17 – SGSF’s #SUPERGirlsInSTEM Summit, The Intersection of AI & Workforce

SUPERGirls SHINE Foundation is hosting a one-day summit for women ages 18-24 focused on the evolving intersection of AI and the STEM workforce. The conference will feature keynote speakers, panel discussions and hands-on workshops.

This event is Tuesday, June 17, from 9 a.m.-1 p.m. at the Ion. Register here.

June 18 – 2025 Obsidi BNXT: Juneteenth Tech Forum

Obsidi.com, an online platform launched by the Black Professionals in Tech Network (BPTN), will host a forum for high-performing Black and allied tech executives. The event offers networking opportunities, keynotes and panels that feature executives from Echelon Health Partners, Hewlett-Packard Enterprise, SAP, Intuit and more.

The event is Wednesday, June 18, at NRG Center. Register here.

June 24 — Houston Methodist Leadership Speaker Series

Head to the Houston Methodist Tech Hub at Ion to hear the latest installment of the Houston Methodist Leadership Speaker Series. Trent Fulin, vice president and CEO at Houston Methodist Cypress Hospital, will discuss the new 105-acre campus and its first 100 days of patient care, followed by a Q&A.

This event is Tuesday, June 23, from 4:45-6 p.m. Register here.

June 25-26 – Carbon Capture Technology Expo and  Hydrogen Technology Conference & Expo North America

Tackling climate change is one of the biggest global challenges that requires immediate action, and many industrial sectors are now looking to new technology to help meet net-zero emission targets. The Carbon Capture Technology Expo is North America's leading event for carbon capture, utilization and storage. The expo offers opportunities to network with industry frontrunners and best-in-class solution providers.

This event begins June 25 at NRG Center. Click here to register. It is co-located with the Hydrogen Technology Conference & Expo North America. Expo passes are free.

June 26 – NASA Tech Talk

Every fourth Thursday of the month, NASA experts, including longtime engineer Montgomery Goforth, present on technology development challenges NASA’s Johnson Space Center and the larger aerospace community are facing and how Houston’s innovation community can leverage them. Stick around after for drinks and networking at Second Draught.

This event is Thursday, June 26, from 6-7 p.m. at the Ion. Register here.

3 Houston innovators who made headlines in May 2025

Innovators to Know

Editor's note: Houston innovators are making waves this month with revolutionary VC funding, big steps towards humanoid robotics, and software that is impacting the agriculture sector. Here are three Houston innovators to know right now.

Zach Ellis, founder and partner of South Loop Ventures

Zach Ellis. Photo via LinkedIn

Zach Ellis Jr., founder and general partner of South Loop Ventures, says the firm wants to address the "billion-dollar blind spot" of inequitable distribution of venture capital to underrepresented founders of color. The Houston-based firm recently closed its debut fund for more than $21 million. Learn more.

Ty Audronis, CEO and founder of Tempest Droneworx

Ty Audronis, CEO and founder of Tempest Droneworx

Ty Audronis, center. Photo via LinkedIn.

Ty Audronis and his company, Tempest Droneworx, made a splash at SXSW Interactive 2025, winning the Best Speed Pitch award at the annual festival. The company is known for it flagship product, Harbinger, a software solution that agnostically gathers data at virtually any scale and presents that data in easy-to-understand visualizations using a video game engine. Audronis says his company won based on its merits and the impact it’s making and will make on the world, beginning with agriculture. Learn more.

Nicolaus Radford, CEO of Persona AI

Nicolaus Radford, founder and CEO of Nauticus RoboticsNicolaus Radford. Image via LinkedIn

Houston-based Persona AI and CEO Nicolaus Radford continue to make steps toward deploying a rugged humanoid robot, and with that comes the expansion of its operations at Houston's Ion. Radford and company will establish a state-of-the-art development center in the prominent corner suite on the first floor of the building, with the expansion slated to begin in June. “We chose the Ion because it’s more than just a building — it’s a thriving innovation ecosystem,” Radford says. Learn more.