Improving Organization in a Paragraph

Read the following paragraph, which discusses the impact of urban green spaces:

Urban areas often suffer from a lack of green spaces, leading to various environmental and health issues. Research suggests that parks and gardens can play a crucial role in improving air quality and providing residents with a space for recreation. Moreover, they contribute to mental well-being by offering a peaceful retreat from the hustle and bustle of city life. Studies have shown that access to greenery can reduce stress and promote social interactions among community members. However, the challenge lies in integrating these green spaces into the already congested urban landscape.

Which of the following revisions would best improve the organization of this paragraph?