Public transportation can be a helpful choice to get around large city. Metro as one of many also serves that function of public transportation effectively. Therefore, I agree that metro is the most convenient way to get around city. Discussing its availability and eco-friendliness will help to explain.
First, metro considered more readily available than other transportation mode because it provides rapid transit services. Unlike buses that only operating around small neighborhoods, metro could cover and connect larger key areas in the city such as bussines disctricts, shopping centers or residential areas. Therefore, in a large city like Tokyo or Jakarta, metro is helpful for carrying passenger to reach their destination without the need of multiple transfer. Thus, this is the reasonable argument why metro is the most convenient way to get around city.
Secondly, metro is enviromentally-safe because it uses energy effeciently compared to buses or cars. The ability to carry the large number of passenger in a single trip will reduce the consumption of energy needed. In addition, metro also electric powered transportion. Differ from cars or buses that still powered by fossil fuels, electricity uses renewable energy which leads to lower greenhouse gas emissions.
In conclusion, metro is an helpful transportation to have in a city because of its availability and eco-friendliness. Hence, metro can be the most effective transportation to get around city. It would be great if more cities use metro as its transportation.