Question

human - made structures such as roads, buildings, and other infrastructure tend to absorb and re - emit more heat than do natural landscapes. hence, urban areas, where human - made structures are highly concentrated, become \heat islands\ of higher temperatures relative to greener, less developed outlying areas. residents of urban heat islands (uhis) tend to use more air conditioning than residents of suburban and rural areas, thereby consuming more energy and disproportionately contributing to air pollution. to mitigate these effects, many urban communities are exploring natural cooling solutions, such as green roofs—vegetative layers grown on rooftops that both absorb air pollutants and reduce the temperature of the roof surface and surrounding air. which choice best states the main idea of the text? choose 1 answer: a the relatively high temperatures of urban heat islands lead to increased energy consumption and pollution, so many urban communities are considering natural cooling solutions. b the primary cause of urban heat islands is the lack of vegetation in cities, which can be easily remedied by planting more trees and creating new communal green spaces, such as green roofs. c urban heat islands are cities that experience higher temperatures relative to surrounding rural areas, as human - made structures like roads and buildings tend to absorb and re - emit more heat than do natural landscapes. d green roofs have become increasingly popular in cities, as they offer a natural solution to both the increased air pollution and the relatively high temperatures of urban areas.

Explanation:

The text first describes how human - made structures cause urban heat islands, leading to more energy consumption and pollution. Then it mentions that urban communities are exploring natural cooling solutions like green roofs to mitigate these effects. Option A captures all these key points. Option B inaccurately claims the primary cause of urban heat islands is lack of vegetation. Option C only focuses on the cause of urban heat islands and not the subsequent issues and solutions. Option D only emphasizes green roofs without the full context of the problem of urban heat islands and related issues.

Answer:

A. The relatively high temperatures of urban heat islands lead to increased energy consumption and pollution, so many urban communities are considering natural cooling solutions.