Analyzing Urban Gardening Structure

Read the following excerpt from a fictional article about urban gardening:

"In recent years, urban gardening has emerged as a significant trend. As cities become increasingly crowded, residents have sought to reclaim space for nature, leading to a flourishing community of gardeners. This transformation of vacant lots into green spaces not only beautifies neighborhoods but also improves local air quality and promotes biodiversity. Furthermore, urban gardening initiatives often bring together diverse groups of people, fostering a sense of community and shared purpose. However, challenges such as soil contamination and limited sunlight remain prevalent, requiring innovative solutions from city planners and residents alike."

Based on this excerpt, which statement best describes the overall structure of the text?