In the distant year of 2150, the Earth has undergone earth - shattering changes and become a vast technological hive. Towering skyscrapers soar into the clouds as if they are about to pierce the sky. The surfaces of the buildings glisten with the unique luster of high - tech materials, and various indicator lights and electronic screens continuously change information on the building bodies. Flying vehicles shuttle orderly over the city like a swarm of bees, and the sound of their engines interweaves into a cacophonous movement. These flying vehicles come in various shapes and sizes. Some are small and lightweight, suitable for single - person travel; others are huge, used for transporting goods and large numbers of passengers. In the city, high - tech facilities can be seen everywhere. Intelligent robots are busily working on the streets, responsible for cleaning, delivery, and various service tasks. People's lives have been all - round permeated and transformed by technology.

  On the outskirts of this bustling city, there is a vast botanical garden, which is like a green pearl inlaid on the edge of the steel jungle. This botanical garden is a precious treasure trove of the Earth's ecological diversity, housing countless rare plants. Stepping into the botanical garden is like entering a world completely different from the outside. Here, it is spring - like all year round, and the climate is pleasant. Ancient ginkgo trees stand tall and straight, and their golden leaves rustle in the gentle breeze as if telling the stories of the years. Exotic flowers and strange herbs compete for beauty. They have different shapes. Some flowers are as large as plates, while others are as small and delicate as can be; some petals are as thin as cicada wings, while others are thick and tough. A quiet stream winds its way through, and the water in the stream is so clear that one can see the bottom. Fish swim merrily in the water, and the green trees and flowers on the banks are reflected on the water surface. The gardeners take good care of every plant. They wear special work clothes and hold various advanced gardening tools to prune, water, and fertilize the plants. This is the last sanctuary of nature and also a haven for people's souls. Many people, when tired from the busy urban life, will come here to feel the tranquility and beauty of nature.

  However, on an ordinary - looking day, the peace was completely broken. A large - scale industrial base not far from the botanical garden, in order to reduce costs and pursue higher profits, engaged in illegal activities. This industrial base is huge in scale, with numerous chimneys. On weekdays, it continuously emits a large amount of exhaust gas into the sky. This time, they illegally discharged untreated pollutants. The sewage containing highly toxic chemicals and unknown radiation seeped silently into the soil of the botanical garden through underground pipes. Wherever the sewage went, the color of the soil gradually turned black, and the originally fertile land became extremely barren. Harmful gases, carried by the gentle breeze, filled every inch of the air in the botanical garden, forming a faint gray smoke that shrouded the entire botanical garden.

  At first, everything seemed normal. But overnight, disaster struck. The originally delicate and charming flowers were as if twisted wantonly by an invisible hand. The petals curled up and deformed, losing their former softness. The once - bright colors became dull, and some even turned into a strange black.