In 2040, our cities underwent a radical transformation, becoming true oases of greenery and sustainable development. Buildings in cities are covered with lush vegetation - green roofs and vertical gardens not only improve aesthetics, but also purify the air and regulate the temperature. The streets are quiet and clean thanks to the widespread use of electric vehicles. Cities are energy self-sufficient thanks to the widespread use of solar panels. Urban parks have evolved into mini-reserves of nature, where residents can observe native species of plants and animals. Advanced recycling and upcycling systems allow the reuse of almost all materials.