NASA: High-density cities emit less gas

New data on carbon dioxide emissions obtained by NASA allowsDetermine the quantity in detail

harmful substances produced by 20 cities around the world and their districts.For the first time, scientists were able to conclude that as a city's population density increases, carbon dioxide emissions per person decrease.

Study also demonstrates how satellitegreenhouse gas measurements can provide fast-growing cities with new tools to track their carbon footprint. Scientists are confident that they will be able to give the authorities specific recommendations that will allow cities to become more "green."

Cities account for more than 70% of globalcarbon dioxide emissions associated with energy production, and rapid urbanization increases their amount. However, some densely populated cities emit more carbon dioxide per capita than others.

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To better understand why some citiesemit more gas than others, NASA has calculated carbon emissions for 20 urban areas on several continents. Cities with different population densities were selected based on the quality and quantity of data available on them. Preference was given to cities with minimal vegetation, since plants can absorb and emit carbon dioxide, which makes it difficult to interpret the results.

“Other scientists used statistics onfuel, the size of houses and industries, - noted in NASA. “We are getting data from space to actually measure the concentration of carbon dioxide over the city.”

Scientists have hypothesized that moredensely populated urban areas tend to emit less carbon dioxide per person, because they are more energy efficient: in these areas less energy is required per person due to the active use of public transport, efficient heating and cooling of apartment buildings.