As a result of the worldwide debate about the global warming and its impacts upon the society, a revolution occurred all over the world in 2025 in which all countries mutually decided to replace cars with bicycles. Originally, cars driven by electricity ad biofuels were proposed as a substitute to the oil driven car, though it required a lot of investment and results could not be equally achieved all over the world because of the scarcity of resources to produce electricity. After decades of thought and cnsideration, countries have mutually consented to get rid of cars altogether. Now, in 2030, roads are crowded with bicycles. People are generally happy to use bicycles because they have not only obviated the need to use oil, but has also rapidly decreased the number of road accidents. The