A new study from the Natural Resources Defense Council finds that cities with a higher proportion of grasslands in their locales have higher levels of the grassland species that provide shade, water, food, and shelter.
Grasslands are important for many wildlife, including birds, reptiles, and insects.
The grasslands are also a key habitat for many insects and plants, like aphids and other aphids.
The study, published in the journal Nature Communications, found that a high proportion of cities with grasslands tended to have higher populations of insects, plants, and mammals.
In fact, grasslands accounted for almost half of the total number of species that are present in the United States.
The highest concentration of insects and vegetation in a city is in Austin, Texas, and the most diverse is in the city of New Orleans.
The number of mammals and birds in cities was higher than in the rest of the country.
The cities with the highest percentage of grassland organisms are also the most densely populated, according to the study.
The most diverse grasslands were found in urban centers.
Cities with more than 2 million people are most likely to have grasslands.
The report found that cities that have a greater proportion of urban grasslands have a higher prevalence of grasses, plants and insects, as well as more plants and animals.
There are approximately 3.2 million hectares (5.3 million acres) of urban groundcover.
That is more than one-third of the entire United States, according the report.
The report found more species of plants and fungi in urban areas than in rural areas.
There were a variety of plants found in grasslands, including a variety that can grow on the ground, such as mustard and dandelion, and more plant species that can be grown in the air, such of cypress, fescue, and pine.
The majority of species found in the grasslands of cities are not native to the US.
The diversity of plant species is higher than the overall numbers found in rural settings.
The researchers suggest that cities can help reduce pollution and carbon emissions by improving habitat quality, including improving water and sewer connections and enhancing urban transportation.