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Houston is one of the only cities where most greenhouse gas emissions come from traffic

Summary

Traffic accounts for slightly more than half of Houston's recorded greenhouse gas emissions. This is the highest proportion among the biggest cities in the United States that provided emissions data to the Carbon Disclosure Project (CDP). The information was gathered via a survey conducted in collaboration with CDP and ICLEI - Local Governments for Sustainability, and it includes self-reported quantities of methane, nitrous oxide, and carbon dioxide, as well as other major greenhouse gases and carcinogens. The data is divided into 51 categories that were contributed by over 1,100 cities, states, and municipalities from across the globe. According to CDP city-level statistics, stationary emitters such as residences and companies, as well as power plants, often account for the lion's share of emissions in cities. This is not the case in Houston, despite its enormous oil and gas sector and expanding housing complexes. Although transportation is clearly a major source of greenhouse gases throughout the country, its prominence in Houston may be due to how effectively it is observed and how poorly other sources are monitored. For example, emissions from the Port of Houston, one of the major ports in the United States, moving 55 million tons of cargo annually and accounting for 20.6 percent of Texas' total gross domestic product, are not included in the city's reporting. Houston, out of all major Texas cities, is reporting data on the fewest known greenhouse gases and carcinogens, excluding more potent greenhouse gases such as sulfur hexafluoride and chemicals known as PFCs, which do not degrade in the environment and may pose serious health risks to both animals and humans, according to the CDC. Cities can only directly manage around 4% of their emissions, which is why enhancing data like this to guide public policy is critical.

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