Why is urban sprawl a concern for environmentalists?

Environmentalists are concerned for urban sprawl because they usually have some major impacts in nature such as: Increase air pollution: The urban sprawl also increases car and truck traffic, this leads to a major increase in air pollution and ground-level smog.

Explanation:

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

pakastainians   indians and iran