Read the following passage and answer the question.
Community gardens are becoming a common sight in urban areas, transforming unused lots into vibrant green spaces.
These gardens do more than just produce fresh fruits and vegetables; they cultivate a sense of community among residents who might otherwise never interact.
Working side-by-side, neighbors share gardening tips, stories, and the bounty of their harvest.
Furthermore, these green oases provide crucial habitats for pollinators like bees and butterflies, which are essential for a healthy ecosystem.
They also offer a unique educational opportunity for children to learn about food sources and the environment firsthand.
What is the main idea of this passage?