Urbanization is a process (16) ________ transforms rural areas into modern cities. In recent decades, many cities have experienced a (17) ________ rise in population, putting pressure on housing and transportation systems. (18) ________ pollution has become a serious issue as industrial activities increase. (19) ________ cities expand, governments must invest more in infrastructure. (20) ________ urban life can be stressful, it still offers better access to education and jobs.

As urban populations continue to grow, cities around the world are facing increasing challenges related to sustainability. One major concern is transportation. Heavy reliance on private vehicles has led to traffic congestion, air pollution, and higher greenhouse gas emissions. To address these issues, many cities are investing in public transportation systems such as buses, subways, and bicycle lanes.
Another important aspect of sustainable cities is waste management. As cities expand, the amount of waste produced increases dramatically. Recycling programs and waste-to-energy technologies are being introduced to reduce landfill use and protect the environment. Public awareness also plays a crucial role, as citizens must actively participate in waste reduction efforts.
Ultimately, sustainable urban development requires cooperation between governments, businesses, and residents. Only through shared responsibility can cities become cleaner, healthier, and more livable for future generations.